| Wednesday, February 7 |
| Future Pirate Humberto Cota is born in San Luis Rio Colorado, Mexico. |
| Monday, March 12 |
| Future Pirate Dave Williams is born in Anchorage, AK. |
| Sunday, March 18 |
| Former Pirate Percy Jones dies in Dallas, TX at the age of 80. |
| Friday, March 30 |
| Future Pirate Mike Johnston is born in Philadelphia, PA. |
| Saturday, March 31 |
| Former Pirate Bob Schultz dies in Nashville, TN at the age of 56. |
| Tuesday, April 3 |
| Former Pirate Harry Simpson dies in Akron, OH at the age of 54. |
| Wednesday, April 4 |
| » Major-league debuts: Mark Clear (Angels) |
| Friday, April 6 |
| » Lost to Expos (1-0), 3-2 | Three Rivers Stadium (0-1) | 0-1 | |
| » W: Elias Sosa (1-0) L: Kent Tekulve (0-1) | Second | 1 out |
| Saturday, April 7 |
| » Defeated Expos (1-1), 7-6 | Three Rivers Stadium (1-1) | 1-1 | |
| » W: Grant Jackson (1-0) L: Elias Sosa (1-1) | Second | 1 out |
| Sunday, April 8 |
| » Lost to Expos (2-1), 5-4 | Three Rivers Stadium (1-2) | 1-2 | |
| » W: Rudy May (1-0) L: Enrique Romo (0-1) S: David Palmer (1) | Third | 1½ out |
| Tuesday, April 10 |
| » Lost to Phillies (1-2), 7-3 | Veteran's Stadium (0-1) | 1-3 | Lost 2 |
| » W: Dick Ruthven (1-0) L: Enrique Romo (0-2) | Fifth | 2½ out |
| Wednesday, April 11 |
| » Lost to Phillies (2-2), 5-4 | Veteran's Stadium (0-2) | 1-4 | Lost 3 |
| » W: Steve Carlton (1-1) L: Bert Blyleven (0-1) | Fourth | 3 out |
| Thursday, April 12 |
| » Defeated Cardinals (3-1), 3-1 | Three Rivers Stadium (2-2) | 2-4 | |
| » W: Don Robinson (1-0) L: John Denny (1-1) | Fifth | 2½ out |
| Friday, April 13 |
| » Defeated Cardinals (3-2), 7-6 | Three Rivers Stadium (3-2) | 3-4 | Won 2 |
| » W: Jim Bibby (1-0) L: Buddy Schultz (0-1) S: Grant Jackson (1) | Third | 2 out |
| Saturday, April 14 |
| » Defeated Cardinals (3-3), 7-4 | Three Rivers Stadium (4-2) | 4-4 | Won 3 |
| » W: Ed Whitson (1-0) L: Bob Forsch (0-1) S: Grant Jackson (2) | Fourth | 2 out |
| Sunday, April 15 |
| » Lost to Cardinals (4-3), 9-4 | Three Rivers Stadium (4-3) | 4-5 | |
| » W: Mark Littell (1-0) L: Kent Tekulve (0-2) | Third | 2 out |
| Tuesday, April 17 |
| » Lost to Phillies (5-3), 13-2 | Three Rivers Stadium (4-4) | 4-6 | Lost 2 |
| » W: Steve Carlton (2-1) L: Bert Blyleven (0-2) | Fourth | 3½ out |
| Wednesday, April 18 |
| » Lost to Phillies (6-3), 3-2 | Three Rivers Stadium (4-5) | 4-7 | Lost 3 |
| » W: Randy Lerch (1-1) L: Don Robinson (1-1) | Fourth | 4½ out |
| Friday, April 20 |
| » Lost to Astros (10-4), 5-4 | Astrodome (0-1) | 4-8 | Lost 4 |
| » W: Joe Sambito (1-0) L: Jim Bibby (1-1) | Fifth | 4½ out |
| Saturday, April 21 |
| » Lost to Astros (11-4), 5-4 | Astrodome (0-2) | 4-9 | Lost 5 |
| » W: Joaquin Andujar (2-0) L: Kent Tekulve (0-3) | Fifth | 5 out |
| Sunday, April 22 |
| » Lost to Astros (12-4), 3-2 | Astrodome (0-3) | 4-10 | Lost 6 |
| » W: Joaquin Andujar (3-0) L: John Candelaria (0-1) S: Joe Sambito (2) | Sixth | 5 out |
| Tuesday, April 24 |
| » Defeated Reds (9-8), 9-2 | Riverfront Stadium (1-0) | 5-10 | |
| » W: Don Robinson (2-1) L: Frank Pastore (0-2) | Sixth | 5½ out |
| Wednesday, April 25 |
| » Defeated Reds (9-9), 3-2 | Riverfront Stadium (2-0) | 6-10 | Won 2 |
| » W: Kent Tekulve (1-3) L: Dave Tomlin (0-1) | Sixth | 5½ out |
| Friday, April 27 |
| » Lost to Astros (14-5), 9-8 | Three Rivers Stadium (4-6) | 6-11 | |
| » W: Frank Riccelli (1-0) L: Ed Whitson (1-1) | Sixth | 6½ out |
| Sunday, April 29 |
| » Defeated Astros (14-6), 10-5 | Three Rivers Stadium (5-6) | 7-11 | |
| » W: Bruce Kison (1-0) L: Joe Niekro (1-2) S: Grant Jackson (3) | Fifth | 6 out |
| Tuesday, May 1 |
| » Lost to Braves (8-13), 5-2 | Three Rivers Stadium (5-7) | 7-12 | |
| » W: Phil Niekro (3-4) L: Kent Tekulve (1-4) | Sixth | 7½ out |
| Wednesday, May 2 |
| » Defeated Braves (8-14), 10-2 | Three Rivers Stadium (6-7) | 8-12 | |
| » W: John Candelaria (1-1) L: Mickey Mahler (0-2) | Sixth | 7 out |
| Friday, May 4 |
| » Lost to Cardinals (12-11), 4-3 | Busch Stadium II (0-1) | 8-13 | |
| » W: Bob Sykes (2-2) L: Don Robinson (2-2) S: Buddy Schultz (2) | Fifth | 7½ out |
| Saturday, May 5 |
| » Defeated Cardinals (12-12), 6-5 | Busch Stadium II (1-1) | 9-13 | |
| » W: Grant Jackson (2-0) L: Pete Vuckovich (2-2) S: Ed Whitson (1) | Fourth | 6½ out |
| Sunday, May 6 |
| » Lost to Cardinals (13-12), 4-2 | Busch Stadium II (1-2) | 9-14 | |
| » W: Silvio Martinez (1-1) L: Bruce Kison (1-1) S: Darold Knowles (2) | Fourth | 7½ out |
| Monday, May 7 |
| » Defeated Braves (8-18), 4-2 | Atlanta-Fulton County Stadium (1-0) | 10-14 | |
| » W: John Candelaria (2-1) L: Mickey Mahler (0-3) S: Kent Tekulve (1) | Fifth | 7½ out |
| Tuesday, May 8 |
| » Lost to Braves (9-18), 4-1 | Atlanta-Fulton County Stadium (1-1) | 10-15 | |
| » W: Eddie Solomon (2-1) L: Rick Rhoden (0-1) | Fifth | 8½ out |
| Wednesday, May 9 |
| » Defeated Braves (9-19), 17-9 | Atlanta-Fulton County Stadium (2-1) | 11-15 | |
| » W: Jim Bibby (2-1) L: Gene Garber (1-5) S: Kent Tekulve (2) | Fifth | 8½ out |
| Former Pirate Charlie Hargreaves dies in Neptune, NJ at the age of 83. |
| Thursday, May 10 |
| Future Pirate Tony Alvarez is born in Caracas, Venezuela. |
| Friday, May 11 |
| » Lost to Reds (18-13), 8-4 | Three Rivers Stadium (6-8) | 11-16 | |
| » W: Dave Tomlin (1-1) L: Ed Whitson (1-2) S: Doug Bair (6) | Fifth | 9 out |
| Saturday, May 12 |
| » Defeated Reds (18-14), 3-2 | Three Rivers Stadium (7-8) | 12-16 | |
| » W: Jim Bibby (3-1) L: Frank Pastore (1-3) S: Grant Jackson (4) | Fifth | 8 out |
| Former Pirate Clyde Kluttz dies in Salisbury, NC at the age of 62. |
| Sunday, May 13 |
| » Lost to Reds (19-14), 7-3 | Three Rivers Stadium (7-9) | 12-17 | |
| » W: Mike LaCoss (4-0) L: John Candelaria (2-2) | Fifth | 9 out |
| Tuesday, May 15 |
| » Lost to Mets (11-20), 3-0 | Three Rivers Stadium (7-10) | 12-18 | Lost 2 |
| » W: Craig Swan (4-3) L: Don Robinson (2-3) S: Skip Lockwood (6) | Fifth | 9 out |
| Wednesday, May 16 |
| » Defeated Mets (11-21), 4-3 | Three Rivers Stadium (8-10) | 13-18 | |
| » W: Enrique Romo (1-2) L: Skip Lockwood (0-5) | Fifth | 9 out |
| Thursday, May 17 |
| » Defeated Mets (11-22), 6-5 | Three Rivers Stadium (9-10) | 14-18 | Won 2 |
| » W: Kent Tekulve (2-4) L: Jesse Orosco (1-2) | Fifth | 9 out |
| Friday, May 18 |
| » Defeated Cubs (16-17), 9-5 | Wrigley Field (1-0) | 15-18 | Won 3 |
| » W: John Candelaria (3-2) L: Ken Holtzman (3-3) | Fifth | 8 out |
| Saturday, May 19 |
| » Defeated Cubs (16-18), 3-0 | Wrigley Field (2-0) | 16-18 | Won 4 |
| » W: Jim Rooker (1-0) L: Mike Krukow (1-3) S: Grant Jackson (5) | Fourth | 7 out |
| Sunday, May 20 |
| » Defeated Cubs (16-19), 6-5 | Wrigley Field (3-0) | 17-18 | Won 5 |
| » W: Don Robinson (3-3) L: Lynn McGlothen (5-5) S: Kent Tekulve (3) | Fourth | 6 out |
| Monday, May 21 |
| » Defeated Expos (23-14), 4-2 | Stade Olympique (1-0) | 18-18 | Won 6 |
| » W: Bert Blyleven (1-2) L: Scott Sanderson (2-3) S: Kent Tekulve (4) | Fourth | 6 out |
| Tuesday, May 22 |
| » Lost to Expos (24-14), 6-3 | Stade Olympique (1-1) | 18-19 | |
| » W: Ross Grimsley (4-2) L: Ed Whitson (1-3) S: Woodie Fryman (2) | Fourth | 7 out |
| Wednesday, May 23 |
| » Lost to Expos (25-14), 3-0 | Stade Olympique (1-2) | 18-20 | Lost 2 |
| » W: Steve Rogers (4-2) L: John Candelaria (3-3) | Fourth | 7 out |
| Former Pirate Bob Chesnes dies in Everett, WA at the age of 59. |
| Friday, May 25 |
| » Tied Mets, 3-3 | Shea Stadium (0-0) | 18-20 | |
| » Starters: Jim Rooker vs Craig Swan | Fourth | 6½ out |
| Saturday, May 26 |
| » Lost to Mets (15-24), 10-8 | Shea Stadium (0-1) | 18-21 | Lost 3 |
| » W: Skip Lockwood (1-5) L: Kent Tekulve (2-5) | Fifth | 7 out |
| Sunday, May 27 |
| » Defeated Mets (15-25), 2-1 | Shea Stadium (1-1) | 19-21 | |
| » W: Grant Jackson (3-0) L: Dale Murray (2-5) | Fourth | 6½ out |
| Monday, May 28 |
| » Defeated Mets (15-26), 6-1 | Shea Stadium (2-1) | 20-21 | Won 2 |
| » W: John Candelaria (4-3) L: Pete Falcone (0-5) S: Grant Jackson (6) | Fourth | 6 out |
| Tuesday, May 29 |
| » Defeated Cubs (20-23), 8-0 | Three Rivers Stadium (10-10) | 21-21 | Won 3 |
| » W: Don Robinson (4-3) L: Ken Holtzman (4-4) | Fourth | 6 out |
| Wednesday, May 30 |
| » Defeated Cubs (20-24), 9-2 | Three Rivers Stadium (11-10) | 22-21 | Won 4 |
| » W: Jim Rooker (2-0) L: Lynn McGlothen (6-6) | Fourth | 6 out |
| Thursday, May 31 |
| » Defeated Cubs (20-25), 4-3 | Three Rivers Stadium (12-10) | 23-21 | Won 5 |
| » W: Bruce Kison (2-1) L: Bruce Sutter (1-2) | Fourth | 6 out |
| Friday, June 1 |
| » Defeated Padres (24-30), 9-8 | Three Rivers Stadium (13-10) | 24-21 | Won 6 |
| » W: Kent Tekulve (3-5) L: Bob Shirley (2-5) | Fourth | 5 out |
| Saturday, June 2 |
| » Lost to Padres (25-30), 3-1 | Three Rivers Stadium (13-11) | 24-22 | |
| » W: Gaylord Perry (5-4) L: John Candelaria (4-4) | Fourth | 5 out |
| Sunday, June 3 |
| » Defeated Padres (25-31), 7-0 | Three Rivers Stadium (14-11) | 25-22 | |
| » W: Bruce Kison (3-1) L: Bob Owchinko (2-2) | Fourth | 4 out |
| Monday, June 4 |
| » Lost to Dodgers (27-29), 4-2 | Three Rivers Stadium (14-12) | 25-23 | |
| » W: Rick Sutcliffe (6-3) L: Jim Rooker (2-1) | Fourth | 5 out |
| Tuesday, June 5 |
| » Defeated Dodgers (27-30), 3-1 | Three Rivers Stadium (15-12) | 26-23 | |
| » W: Bert Blyleven (2-2) L: Don Sutton (6-5) S: Kent Tekulve (5) | Fourth | 4 out |
| Wednesday, June 6 |
| » Defeated Dodgers (27-31), 5-4 | Three Rivers Stadium (16-12) | 27-23 | Won 2 |
| » W: Enrique Romo (2-2) L: Bob Welch (4-3) S: Kent Tekulve (6) | Third | 4 out |
| Friday, June 8 |
| » Defeated Giants (27-31), 3-2 | Three Rivers Stadium (17-12) | 28-23 | Won 3 |
| » W: Enrique Romo (3-2) L: John Curtis (1-3) S: Grant Jackson (7) | Third | 3 out |
| Saturday, June 9 |
| » Lost to Giants (28-31), 6-2 | Three Rivers Stadium (17-13) | 28-24 | |
| » W: Vida Blue (7-6) L: Bruce Kison (3-2) | Third | 3 out |
| Sunday, June 10 |
| » Lost to Giants (29-31), 7-4 | Three Rivers Stadium (17-14) | 28-25 | Lost 2 |
| » W: Gary Lavelle (4-2) L: Enrique Romo (3-3) | Second | 3 out |
| Tuesday, June 12 |
| » Lost to Padres (28-35), 6-3 | San Diego/Jack Murphy Stadium (0-1) | 28-26 | Lost 3 |
| » W: Gaylord Perry (6-4) L: John Candelaria (4-5) | Fourth | 4 out |
| Former Pirate Bill Brenzel dies in Oakland, CA at the age of 70. |
| Wednesday, June 13 |
| » Lost to Padres (29-35), 3-2 | San Diego/Jack Murphy Stadium (0-2) | 28-27 | Lost 4 |
| » W: Bob Owchinko (3-2) L: Bruce Kison (3-3) S: Rollie Fingers (9) | Fourth | 5 out |
| Thursday, June 14 |
| » Lost to Padres (30-35), 2-1 | San Diego/Jack Murphy Stadium (0-3) | 28-28 | Lost 5 |
| » W: John D'Acquisto (3-4) L: John Candelaria (4-6) | Fourth | 6 out |
| Friday, June 15 |
| » Defeated Dodgers (30-35), 6-2 | Dodger Stadium (1-0) | 29-28 | |
| » W: Bert Blyleven (3-2) L: Don Sutton (6-7) S: Kent Tekulve (7) | Fourth | 5 out |
| Saturday, June 16 |
| » Defeated Dodgers (30-36), 6-3 | Dodger Stadium (2-0) | 30-28 | Won 2 |
| » W: Don Robinson (5-3) L: Bob Welch (4-4) | Fourth | 5 out |
| Sunday, June 17 |
| » Defeated Dodgers (30-37), 5-1 | Dodger Stadium (3-0) | 31-28 | Won 3 |
| » W: Ed Whitson (2-3) L: Jerry Reuss (2-5) S: Kent Tekulve (8) | Fourth | 5 out |
| Tuesday, June 19 |
| » Defeated Giants (33-34), 9-4 | Candlestick Park (1-0) | 32-28 | Won 4 |
| » W: John Candelaria (5-6) L: John Montefusco (1-3) S: Enrique Romo (1) | Third | 4½ out |
| Wednesday, June 20 |
| » Defeated Giants (33-35), 8-5 | Candlestick Park (2-0) | 33-28 | Won 5 |
| » W: Grant Jackson (4-0) L: Gary Lavelle (5-4) S: Kent Tekulve (9) | Second | 4½ out |
| Friday, June 22 |
| » Defeated Cubs (32-31), 7-2 | Three Rivers Stadium (18-14) | 34-28 | Won 6 |
| » W: Bert Blyleven (4-2) L: Ken Holtzman (5-6) | Second | 4½ out |
| Saturday, June 23 |
| » Lost to Cubs (33-31), 4-3 | Three Rivers Stadium (18-15) | 34-29 | |
| » W: Mike Krukow (4-5) L: Don Robinson (5-4) S: Bruce Sutter (17) | Second | 5½ out |
| Sunday, June 24 |
| » Lost to Cubs (34-31), 5-0 | Three Rivers Stadium (18-16) | 34-30 | Lost 2 |
| » W: Rick Reuschel (6-5) L: Bruce Kison (3-4) | Second | 5½ out |
| Monday, June 25 |
| » Defeated Mets (27-38), 8-1 | Shea Stadium (3-1) | 35-30 | |
| » W: John Candelaria (6-6) L: Craig Swan (7-6) | Second | 6 out |
| » Lost to Mets (28-38), 4-0 | Shea Stadium (3-2) | 35-31 | |
| » W: Pete Falcone (1-5) L: Jim Rooker (2-2) | Second | 6 out |
| Tuesday, June 26 |
| » Defeated Mets (28-39), 2-1 | Shea Stadium (4-2) | 36-31 | |
| » W: Bert Blyleven (5-2) L: Tom Hausman (0-3) S: Grant Jackson (8) | Second | 6 out |
| Wednesday, June 27 |
| » Lost to Mets (29-39), 12-9 | Three Rivers Stadium (18-17) | 36-32 | |
| » W: Wayne Twitchell (2-0) L: Grant Jackson (4-1) | Second | 6 out |
| Thursday, June 28 |
| » Lost to Mets (30-39), 3-2 | Three Rivers Stadium (18-18) | 36-33 | Lost 2 |
| » W: Neil Allen (2-5) L: Jim Bibby (3-2) S: Ed Glynn (3) | Third | 6½ out |
| Friday, June 29 |
| » Defeated Expos (42-27), 6-5 | Three Rivers Stadium (19-18) | 37-33 | |
| » W: Bruce Kison (4-4) L: Bill Lee (7-5) S: Kent Tekulve (10) | Second | 5½ out |
| Saturday, June 30 |
| » Lost to Expos (43-27), 5-3 | Three Rivers Stadium (19-19) | 37-34 | |
| » W: Scott Sanderson (5-4) L: Bert Blyleven (5-3) S: Woodie Fryman (5) | Third | 6½ out |
| Monday, July 2 |
| » Defeated Cardinals (38-35), 5-4 | Busch Stadium II (2-2) | 38-34 | |
| » W: Enrique Romo (4-3) L: Darold Knowles (2-4) S: Grant Jackson (9) | Second | 6½ out |
| Tuesday, July 3 |
| » Defeated Cardinals (38-36), 4-1 | Busch Stadium II (3-2) | 39-34 | Won 2 |
| » W: John Candelaria (7-6) L: Bob Forsch (3-9) S: Enrique Romo (2) | Second | 5½ out |
| Wednesday, July 4 |
| » Defeated Cardinals (38-37), 6-4 | Busch Stadium II (4-2) | 40-34 | Won 3 |
| » W: Bert Blyleven (6-3) L: Pete Vuckovich (7-5) S: Grant Jackson (10) | Second | 5½ out |
| Thursday, July 5 |
| » Lost to Cardinals (39-37), 2-0 | Busch Stadium II (4-3) | 40-35 | |
| » W: John Fulgham (2-1) L: Jim Rooker (2-3) | Second | 5½ out |
| Friday, July 6 |
| » Lost to Reds (43-41), 2-1 | Riverfront Stadium (2-1) | 40-36 | Lost 2 |
| » W: Doug Bair (5-4) L: Grant Jackson (4-2) | Third | 6½ out |
| Saturday, July 7 |
| » Lost to Reds (44-41), 6-2 | Riverfront Stadium (2-2) | 40-37 | Lost 3 |
| » W: Paul Moskau (5-3) L: Don Robinson (5-5) | Fourth | 7½ out |
| Sunday, July 8 |
| » Lost to Reds (45-41), 4-2 | Riverfront Stadium (2-3) | 40-38 | Lost 4 |
| » W: Fred Norman (5-7) L: John Candelaria (7-7) | Fourth | 7 out |
| » Defeated Reds (45-42), 2-1 | Riverfront Stadium (3-3) | 41-38 | |
| » W: Grant Jackson (5-2) L: Dave Tomlin (2-2) S: Kent Tekulve (11) | Fourth | 7 out |
| Tuesday, July 10 |
| » Defeated Astros (53-36), 4-3 | Astrodome (1-3) | 42-38 | Won 2 |
| » W: Jim Bibby (4-2) L: Joaquin Andujar (10-5) S: Kent Tekulve (12) | Fourth | 6½ out |
| Wednesday, July 11 |
| » Defeated Astros (53-37), 5-1 | Astrodome (2-3) | 43-38 | Won 3 |
| » W: Bruce Kison (5-4) L: J.R. Richard (7-9) | Third | 5½ out |
| Thursday, July 12 |
| » Defeated Astros (53-38), 5-3 | Astrodome (3-3) | 44-38 | Won 4 |
| » W: Bert Blyleven (7-3) L: Joe Niekro (13-4) S: Kent Tekulve (13) | Third | 4½ out |
| Friday, July 13 |
| » Lost to Braves (39-51), 13-4 | Atlanta-Fulton County Stadium (2-2) | 44-39 | |
| » W: Phil Niekro (12-11) L: Jim Rooker (2-4) | Fourth | 5 out |
| Saturday, July 14 |
| » Defeated Braves (39-52), 5-1 | Atlanta-Fulton County Stadium (3-2) | 45-39 | |
| » W: John Candelaria (8-7) L: Rick Matula (6-6) | Fourth | 4 out |
| Sunday, July 15 |
| » Defeated Braves (39-53), 7-3 | Atlanta-Fulton County Stadium (4-2) | 46-39 | Won 2 |
| » W: Jim Bibby (5-2) L: Eddie Solomon (4-6) | Fourth | 4 out |
| Thursday, July 19 |
| » Defeated Astros (54-41), 9-5 | Three Rivers Stadium (20-19) | 47-39 | Won 3 |
| » W: Dave Roberts (1-2) L: Ken Forsch (5-6) | Second | 2½ out |
| » Defeated Astros (54-42), 4-2 | Three Rivers Stadium (21-19) | 48-39 | Won 4 |
| » W: Bruce Kison (6-4) L: Joe Niekro (13-5) S: Grant Jackson (11) | Second | 2½ out |
| Friday, July 20 |
| » Defeated Astros (54-43), 9-3 | Three Rivers Stadium (22-19) | 49-39 | Won 5 |
| » W: John Candelaria (9-7) L: J.R. Richard (7-11) | Second | 1½ out |
| Saturday, July 21 |
| » Defeated Astros (54-44), 6-5 | Three Rivers Stadium (23-19) | 50-39 | Won 6 |
| » W: Enrique Romo (5-3) L: Joe Sambito (4-3) S: Kent Tekulve (14) | Second | 1½ out |
| Sunday, July 22 |
| » Defeated Braves (40-56), 5-4 | Three Rivers Stadium (24-19) | 51-39 | Won 7 |
| » W: Don Robinson (6-5) L: Eddie Solomon (4-7) S: Kent Tekulve (15) | Second | ½ out |
| » Defeated Braves (40-57), 3-2 | Three Rivers Stadium (25-19) | 52-39 | Won 8 |
| » W: Jim Bibby (6-2) L: Mickey Mahler (2-9) S: Kent Tekulve (16) | Second | ½ out |
| Monday, July 23 |
| » Defeated Braves (40-58), 7-1 | Three Rivers Stadium (26-19) | 53-39 | Won 9 |
| » W: Bert Blyleven (8-3) L: Preston Hanna (0-1) | Second | 1 out |
| » Lost to Braves (41-58), 8-0 | Three Rivers Stadium (26-20) | 53-40 | |
| » W: Phil Niekro (14-11) L: Jim Rooker (2-5) | Second | 1 out |
| Tuesday, July 24 |
| » Lost to Reds (52-49), 6-5 | Three Rivers Stadium (26-21) | 53-41 | Lost 2 |
| » W: Fred Norman (7-8) L: Bruce Kison (6-5) S: Doug Bair (14) | Second | 1 out |
| Wednesday, July 25 |
| » Lost to Reds (53-49), 6-5 | Three Rivers Stadium (26-22) | 53-42 | Lost 3 |
| » W: Doug Bair (6-5) L: Kent Tekulve (3-6) | Second | 2 out |
| Thursday, July 26 |
| » Lost to Reds (54-49), 9-7 | Three Rivers Stadium (26-23) | 53-43 | Lost 4 |
| » W: Mario Soto (1-2) L: Dave Roberts (1-3) S: Tom Hume (3) | Third | 2½ out |
| Friday, July 27 |
| » Defeated Expos (54-40), 5-4 | Stade Olympique (2-2) | 54-43 | |
| » W: Kent Tekulve (4-6) L: Elias Sosa (5-6) S: Enrique Romo (3) | Third | 1½ out |
| » Defeated Expos (54-41), 9-1 | Stade Olympique (3-2) | 55-43 | Won 2 |
| » W: Bert Blyleven (9-3) L: Scott Sanderson (6-6) | Third | 1½ out |
| Saturday, July 28 |
| » Defeated Expos (54-42), 5-3 | Stade Olympique (4-2) | 56-43 | Won 3 |
| » W: Jim Bibby (7-2) L: Dan Schatzeder (5-4) S: Kent Tekulve (17) | First | -- |
| Sunday, July 29 |
| » Lost to Expos (55-42), 5-3 | Stade Olympique (4-3) | 56-44 | |
| » W: Steve Rogers (10-6) L: Bruce Kison (6-6) | Second | 1½ out |
| Monday, July 30 |
| » Defeated Mets (43-56), 8-5 | Three Rivers Stadium (27-23) | 57-44 | |
| » W: Grant Jackson (6-2) L: Dwight Bernard (0-2) S: Kent Tekulve (18) | Second | 1 out |
| Tuesday, July 31 |
| » Lost to Mets (44-56), 2-1 | Three Rivers Stadium (27-24) | 57-45 | |
| » W: Wayne Twitchell (5-2) L: Bert Blyleven (9-4) S: Ed Glynn (6) | Second | 1 out |
| Wednesday, August 1 |
| » Defeated Cardinals (51-50), 4-3 | Three Rivers Stadium (28-24) | 58-45 | |
| » W: Enrique Romo (6-3) L: Bob Forsch (4-10) S: Kent Tekulve (19) | Second | 1 out |
| Thursday, August 2 |
| » Lost to Cardinals (52-50), 5-4 | Three Rivers Stadium (28-25) | 58-46 | |
| » W: George Frazier (2-2) L: Grant Jackson (6-3) S: Darold Knowles (6) | Second | 2 out |
| Friday, August 3 |
| » Defeated Phillies (56-51), 6-3 | Three Rivers Stadium (29-25) | 59-46 | |
| » W: Enrique Romo (7-3) L: Tug McGraw (3-2) | Second | 1½ out |
| » Defeated Phillies (56-52), 5-1 | Three Rivers Stadium (30-25) | 60-46 | Won 2 |
| » W: Jim Bibby (8-2) L: Larry Christenson (2-7) | Second | 1½ out |
| Saturday, August 4 |
| » Defeated Phillies (56-53), 4-0 | Three Rivers Stadium (31-25) | 61-46 | Won 3 |
| » W: John Candelaria (10-7) L: Nino Espinosa (11-9) | Second | 1½ out |
| Sunday, August 5 |
| » Defeated Phillies (56-54), 12-8 | Three Rivers Stadium (32-25) | 62-46 | Won 4 |
| » W: Kent Tekulve (5-6) L: Rawly Eastwick (1-2) | First | -- |
| » Defeated Phillies (56-55), 5-2 | Three Rivers Stadium (33-25) | 63-46 | Won 5 |
| » W: Enrique Romo (8-3) L: Dickie Noles (3-3) S: Kent Tekulve (20) | First | -- |
| Tuesday, August 7 |
| » Lost to Cubs (58-49), 15-2 | Wrigley Field (3-1) | 63-47 | |
| » W: Rick Reuschel (11-7) L: Jim Rooker (2-6) | First | -- |
| Wednesday, August 8 |
| » Defeated Cubs (58-50), 5-2 | Wrigley Field (4-1) | 64-47 | |
| » W: Kent Tekulve (6-6) L: Dick Tidrow (10-4) | First | -- |
| Thursday, August 9 |
| » Lost to Cubs (59-50), 11-3 | Wrigley Field (4-2) | 64-48 | |
| » W: Dennis Lamp (8-7) L: John Candelaria (10-8) | First | -- |
| Friday, August 10 |
| » Lost to Phillies (60-55), 4-3 | Veteran's Stadium (0-3) | 64-49 | Lost 2 |
| » W: Rawly Eastwick (2-2) L: Grant Jackson (6-4) | First | -- |
| » Defeated Phillies (60-56), 3-2 | Veteran's Stadium (1-3) | 65-49 | |
| » W: Bruce Kison (7-6) L: Randy Lerch (6-11) S: Kent Tekulve (21) | First | -- |
| Saturday, August 11 |
| » Defeated Phillies (60-57), 14-11 | Veteran's Stadium (2-3) | 66-49 | Won 2 |
| » W: Enrique Romo (9-3) L: Rawly Eastwick (2-3) S: Kent Tekulve (22) | First | -- |
| Sunday, August 12 |
| » Major-league debuts: Alan Knicely (Astros) |
| Monday, August 13 |
| » Defeated Phillies (60-58), 9-1 | Veteran's Stadium (3-3) | 67-49 | Won 3 |
| » W: Jim Bibby (9-2) L: Larry Christenson (3-8) | First | -- |
| Tuesday, August 14 |
| » Defeated Padres (53-67), 7-1 | Three Rivers Stadium (34-25) | 68-49 | Won 4 |
| » W: John Candelaria (11-8) L: John D'Acquisto (8-10) | First | -- |
| Wednesday, August 15 |
| » Defeated Padres (53-68), 5-1 | Three Rivers Stadium (35-25) | 69-49 | Won 5 |
| » W: Bert Blyleven (10-4) L: Randy Jones (9-8) | First | -- |
| Thursday, August 16 |
| » Defeated Padres (53-69), 5-4 | Three Rivers Stadium (36-25) | 70-49 | Won 6 |
| » W: Bruce Kison (8-6) L: Gaylord Perry (10-10) S: Enrique Romo (4) | First | -- |
| Friday, August 17 |
| » Lost to Dodgers (56-65), 7-6 | Three Rivers Stadium (36-26) | 70-50 | |
| » W: Dave Patterson (3-0) L: Jim Bibby (9-3) S: Bobby Castillo (1) | First | -- |
| Saturday, August 18 |
| » Lost to Dodgers (57-65), 5-1 | Three Rivers Stadium (36-27) | 70-51 | Lost 2 |
| » W: Jerry Reuss (4-10) L: Don Robinson (6-6) | First | -- |
| Sunday, August 19 |
| » Defeated Dodgers (57-66), 2-0 | Three Rivers Stadium (37-27) | 71-51 | |
| » W: Kent Tekulve (7-6) L: Burt Hooton (11-9) | First | -- |
| Monday, August 20 |
| » Defeated Giants (57-68), 6-5 | Three Rivers Stadium (38-27) | 72-51 | Won 2 |
| » W: Enrique Romo (10-3) L: Gary Lavelle (7-7) S: Kent Tekulve (23) | First | -- |
| Tuesday, August 21 |
| » Lost to Giants (58-68), 6-1 | Three Rivers Stadium (38-28) | 72-52 | |
| » W: Bob Knepper (9-8) L: Bruce Kison (8-7) | First | -- |
| Wednesday, August 22 |
| » Defeated Giants (58-69), 8-6 | Three Rivers Stadium (39-28) | 73-52 | |
| » W: Kent Tekulve (8-6) L: Gary Lavelle (7-8) | First | -- |
| Friday, August 24 |
| » Lost to Padres (55-74), 3-2 | San Diego/Jack Murphy Stadium (0-4) | 73-53 | |
| » W: Randy Jones (10-9) L: Enrique Romo (10-4) S: Mark Lee (3) | First | -- |
| Saturday, August 25 |
| » Defeated Padres (55-75), 4-3 | San Diego/Jack Murphy Stadium (1-4) | 74-53 | |
| » W: Dave Roberts (2-3) L: John D'Acquisto (8-12) | First | -- |
| Sunday, August 26 |
| » Defeated Padres (55-76), 9-2 | San Diego/Jack Murphy Stadium (2-4) | 75-53 | Won 2 |
| » W: Bruce Kison (9-7) L: Bob Shirley (6-13) | First | -- |
| Monday, August 27 |
| » Lost to Dodgers (61-69), 4-2 | Dodger Stadium (3-1) | 75-54 | |
| » W: Ken Brett (4-3) L: Kent Tekulve (8-7) | First | -- |
| Tuesday, August 28 |
| » Defeated Dodgers (61-70), 4-1 | Dodger Stadium (4-1) | 76-54 | |
| » W: John Candelaria (12-8) L: Charlie Hough (4-5) | First | -- |
| Wednesday, August 29 |
| » Defeated Dodgers (61-71), 4-1 | Dodger Stadium (5-1) | 77-54 | Won 2 |
| » W: Bert Blyleven (11-4) L: Jerry Reuss (4-12) S: Kent Tekulve (24) | First | -- |
| Friday, August 31 |
| » Defeated Giants (60-74), 6-4 | Candlestick Park (3-0) | 78-54 | Won 3 |
| » W: Don Robinson (7-6) L: John Curtis (9-9) S: Grant Jackson (12) | First | -- |
| Saturday, September 1 |
| » Defeated Giants (60-75), 5-3 | Candlestick Park (4-0) | 79-54 | Won 4 |
| » W: Bruce Kison (10-7) L: John Montefusco (3-6) S: Grant Jackson (13) | First | -- |
| » Defeated Giants (60-76), 7-2 | Candlestick Park (5-0) | 80-54 | Won 5 |
| » W: Jim Bibby (10-3) L: Bob Knepper (9-10) | First | -- |
| Sunday, September 2 |
| » Defeated Giants (60-77), 5-3 | Candlestick Park (6-0) | 81-54 | Won 6 |
| » W: John Candelaria (13-8) L: Vida Blue (10-13) | First | -- |
| Monday, September 3 |
| » Lost to Phillies (69-67), 2-0 | Three Rivers Stadium (39-29) | 81-55 | |
| » W: Steve Carlton (14-11) L: Bert Blyleven (11-5) S: Tug McGraw (14) | First | -- |
| » Defeated Phillies (69-68), 7-3 | Three Rivers Stadium (40-29) | 82-55 | |
| » W: Jim Rooker (3-6) L: Randy Lerch (7-12) S: Kent Tekulve (25) | First | -- |
| Wednesday, September 5 |
| » Defeated Cardinals (74-62), 7-5 | Busch Stadium II (5-3) | 83-55 | Won 2 |
| » W: Dave Roberts (3-3) L: Roy Thomas (3-3) S: Kent Tekulve (26) | First | -- |
| Thursday, September 6 |
| » Lost to Cardinals (75-62), 8-6 | Busch Stadium II (5-4) | 83-56 | |
| » W: Silvio Martinez (13-7) L: Jim Bibby (10-4) S: Will McEnaney (2) | First | -- |
| Friday, September 7 |
| » Defeated Mets (54-84), 6-4 | Shea Stadium (5-2) | 84-56 | |
| » W: Grant Jackson (7-4) L: Neil Allen (4-9) | First | -- |
| Saturday, September 8 |
| » Lost to Mets (55-84), 3-2 | Shea Stadium (5-3) | 84-57 | |
| » W: Dock Ellis (4-12) L: Jim Rooker (3-7) | First | -- |
| Sunday, September 9 |
| » Defeated Mets (55-85), 6-5 | Shea Stadium (6-3) | 85-57 | |
| » W: Kent Tekulve (9-7) L: Ed Glynn (1-3) | First | -- |
| Tuesday, September 11 |
| » Defeated Cardinals (76-65), 7-3 | Three Rivers Stadium (41-29) | 86-57 | Won 2 |
| » W: Dave Roberts (4-3) L: John Denny (7-11) | First | -- |
| Wednesday, September 12 |
| » Defeated Cardinals (76-66), 2-0 | Three Rivers Stadium (42-29) | 87-57 | Won 3 |
| » W: John Candelaria (14-8) L: Bob Forsch (9-11) S: Kent Tekulve (27) | First | -- |
| Saturday, September 15 |
| » Defeated Mets (55-89), 5-4 | Three Rivers Stadium (43-29) | 88-57 | Won 4 |
| » W: Dave Roberts (5-3) L: Ed Glynn (1-4) S: Kent Tekulve (28) | First | -- |
| Sunday, September 16 |
| » Lost to Mets (56-89), 3-0 | Three Rivers Stadium (43-30) | 88-58 | |
| » W: Pete Falcone (6-13) L: John Candelaria (14-9) S: Neil Allen (7) | Second | 1 out |
| Monday, September 17 |
| » Defeated Expos (87-58), 2-1 | Stade Olympique (5-3) | 89-58 | |
| » W: Don Robinson (8-6) L: Steve Rogers (13-10) | First | -- |
| Tuesday, September 18 |
| » Defeated Expos (87-59), 5-3 | Stade Olympique (6-3) | 90-58 | Won 2 |
| » W: Grant Jackson (8-4) L: Dale Murray (4-9) S: Dave Roberts (4) | First | -- |
| Wednesday, September 19 |
| » Defeated Phillies (78-73), 9-6 | Veteran's Stadium (4-3) | 91-58 | Won 3 |
| » W: Kent Tekulve (10-7) L: Rawly Eastwick (3-5) S: Grant Jackson (14) | First</ |
