| Tuesday, January 4 |
| Future Pirate Brian O'Connor is born in Cincinnati, OH. |
| Saturday, February 5 |
| Future Pirate Javier Martinez is born in Bayamon, P.R. |
| Tuesday, February 15 |
| Former Pirate Diomedes Olivo dies in Santo Domingo, D.R. at the age of 59. |
| Thursday, February 24 |
| Future Pirate Bronson Arroyo is born in Key West, FL. |
| Thursday, March 10 |
| Future Pirate Tike Redman is born in Tuscaloosa, AL. |
| Wednesday, April 6 |
| » Major-league debuts: Jose Baez (Mariners) |
| Thursday, April 7 |
| » Lost to Cardinals (1-0), 12-6 | Three Rivers Stadium (0-1) | 0-1 | |
| » W: John Denny (1-0) L: Jerry Reuss (0-1) | Third | 1 out |
| Saturday, April 9 |
| » Lost to Cardinals (2-0), 8-2 | Three Rivers Stadium (0-2) | 0-2 | Lost 2 |
| » W: Bob Forsch (1-0) L: Bruce Kison (0-1) | Fourth | 2 out |
| Sunday, April 10 |
| » Lost to Cardinals (3-0), 8-7 | Three Rivers Stadium (0-3) | 0-3 | Lost 3 |
| » W: Clay Carroll (1-0) L: Jim Rooker (0-1) S: John Urrea (1) | Sixth | 3 out |
| » Major-league debuts: John Urrea (Cardinals) |
| Tuesday, April 12 |
| » Defeated Expos (2-1), 2-1 | Three Rivers Stadium (1-3) | 1-3 | |
| » W: Rich Gossage (1-0) L: Will McEnaney (0-1) | Fourth | 2 out |
| Wednesday, April 13 |
| » Defeated Expos (2-2), 3-0 | Three Rivers Stadium (2-3) | 2-3 | Won 2 |
| » W: Bruce Kison (1-1) L: Steve Rogers (0-1) | Fourth | 2 out |
| Friday, April 15 |
| » Defeated Cardinals (5-2), 7-0 | Busch Stadium II (1-0) | 3-3 | Won 3 |
| » W: Jim Rooker (1-1) L: Pete Falcone (0-1) | Third | 1½ out |
| Saturday, April 16 |
| » Defeated Cardinals (5-3), 3-1 | Busch Stadium II (2-0) | 4-3 | Won 4 |
| » W: John Candelaria (1-0) L: Eric Rasmussen (0-2) S: Rich Gossage (1) | Second | ½ out |
| Sunday, April 17 |
| » Lost to Cardinals (6-3), 4-3 | Busch Stadium II (2-1) | 4-4 | |
| » W: John Denny (3-0) L: Jerry Reuss (0-2) S: John Urrea (3) | Fourth | 1½ out |
| Monday, April 18 |
| » Lost to Expos (5-3), 6-5 | Stade Olympique (0-1) | 4-5 | Lost 2 |
| » W: Bill Atkinson (2-0) L: Odell Jones (0-1) | Fourth | 2½ out |
| Tuesday, April 19 |
| » Lost to Expos (6-3), 6-0 | Stade Olympique (0-2) | 4-6 | Lost 3 |
| » W: Don Stanhouse (1-1) L: Larry Demery (0-1) | Fourth | 2½ out |
| Future Pirate Joe Beimel is born in St. Marys, PA. Former Pirate Fred Carisch dies in San Gabriel, CA at the age of 96 |
| Wednesday, April 20 |
| » Defeated Expos (6-4), 8-6 | Stade Olympique (1-2) | 5-6 | |
| » W: Jim Rooker (2-1) L: Gerry Hannahs (1-1) S: Kent Tekulve (1) | Fourth | 2½ out |
| Thursday, April 21 |
| Future Pirate Kip Wells is born in Houston, TX. |
| Friday, April 22 |
| » Defeated Mets (6-7), 4-3 | Shea Stadium (1-0) | 6-6 | Won 2 |
| » W: Kent Tekulve (1-0) L: Bob Myrick (0-1) | Third | 2½ out |
| Saturday, April 23 |
| » Defeated Mets (6-8), 6-5 | Shea Stadium (2-0) | 7-6 | Won 3 |
| » W: Rich Gossage (2-0) L: Ray Sadecki (0-1) | Third | 1½ out |
| Tuesday, April 26 |
| » Defeated Phillies (5-8), 5-0 | Three Rivers Stadium (3-3) | 8-6 | Won 4 |
| » W: John Candelaria (2-0) L: Larry Christenson (1-2) S: Rich Gossage (2) | First | -- |
| Wednesday, April 27 |
| » Defeated Phillies (5-9), 7-3 | Three Rivers Stadium (4-3) | 9-6 | Won 5 |
| » W: Bruce Kison (2-1) L: Wayne Twitchell (0-3) | First | -- |
| Friday, April 29 |
| » Lost to Astros (9-10), 11-3 | Three Rivers Stadium (4-4) | 9-7 | |
| » W: Floyd Bannister (1-1) L: Jerry Reuss (0-3) | Second | 1 out |
| Saturday, April 30 |
| » Defeated Astros (9-11), 10-0 | Three Rivers Stadium (5-4) | 10-7 | |
| » W: Jim Rooker (3-1) L: Doug Konieczny (1-1) | Second | 1 out |
| Sunday, May 1 |
| » Defeated Astros (9-12), 4-3 | Three Rivers Stadium (6-4) | 11-7 | Won 2 |
| » W: Rich Gossage (3-0) L: Ken Forsch (2-2) | Second | 1 out |
| Monday, May 2 |
| » Defeated Braves (8-14), 11-1 | Atlanta-Fulton County Stadium (1-0) | 12-7 | Won 3 |
| » W: Bruce Kison (3-1) L: Buzz Capra (0-1) | First | -- |
| Tuesday, May 3 |
| » Defeated Braves (8-15), 8-7 | Atlanta-Fulton County Stadium (2-0) | 13-7 | Won 4 |
| » W: Kent Tekulve (2-0) L: Phil Niekro (0-5) S: Grant Jackson (1) | First | -- |
| Wednesday, May 4 |
| » Defeated Braves (8-16), 8-0 | Atlanta-Fulton County Stadium (3-0) | 14-7 | Won 5 |
| » W: Larry Demery (1-1) L: Frank LaCorte (1-4) | First | -- |
| » Major-league debuts: Barry Bonnell (Braves) |
| Friday, May 6 |
| » Defeated Reds (10-13), 6-3 | Three Rivers Stadium (7-4) | 15-7 | Won 6 |
| » W: John Candelaria (3-0) L: Jack Billingham (3-2) S: Rich Gossage (3) | First | -- |
| Saturday, May 7 |
| » Defeated Reds (10-14), 12-10 | Three Rivers Stadium (8-4) | 16-7 | Won 7 |
| » W: Terry Forster (1-0) L: Pat Zachry (2-4) S: Kent Tekulve (2) | First | -- |
| Sunday, May 8 |
| » Defeated Reds (10-15), 6-4 | Three Rivers Stadium (9-4) | 17-7 | Won 8 |
| » W: Odell Jones (1-1) L: Fred Norman (1-2) S: Rich Gossage (4) | First | -- |
| Tuesday, May 10 |
| » Defeated Braves (8-20), 3-0 | Three Rivers Stadium (10-4) | 18-7 | Won 9 |
| » W: Jim Rooker (4-1) L: Buzz Capra (0-3) S: Kent Tekulve (3) | First | -- |
| » Defeated Braves (8-21), 2-1 | Three Rivers Stadium (11-4) | 19-7 | Won 10 |
| » W: Larry Demery (2-1) L: Don Collins (0-1) S: Rich Gossage (5) | First | -- |
| Wednesday, May 11 |
| » Defeated Braves (8-22), 2-1 | Three Rivers Stadium (12-4) | 20-7 | Won 11 |
| » W: John Candelaria (4-0) L: Phil Niekro (0-7) S: Rich Gossage (6) | First | -- |
| Thursday, May 12 |
| » Lost to Braves (9-22), 6-1 | Three Rivers Stadium (12-5) | 20-8 | |
| » W: Max Leon (1-1) L: Bruce Kison (3-2) | First | -- |
| Friday, May 13 |
| » Lost to Astros (13-18), 3-0 | Astrodome (0-1) | 20-9 | Lost 2 |
| » W: Mark Lemongello (1-4) L: Jerry Reuss (0-4) S: Ken Forsch (3) | First | -- |
| Saturday, May 14 |
| » Defeated Astros (13-19), 6-2 | Astrodome (1-1) | 21-9 | |
| » W: Larry Demery (3-1) L: Joaquin Andujar (2-3) S: Rich Gossage (7) | First | -- |
| Sunday, May 15 |
| » Defeated Astros (13-20), 3-1 | Astrodome (2-1) | 22-9 | Won 2 |
| » W: Kent Tekulve (3-0) L: J.R. Richard (2-4) | First | -- |
| Tuesday, May 17 |
| » Defeated Reds (14-19), 3-0 | Riverfront Stadium (1-0) | 23-9 | Won 3 |
| » W: John Candelaria (5-0) L: Jack Billingham (4-3) S: Rich Gossage (8) | First | -- |
| Wednesday, May 18 |
| » Lost to Reds (15-19), 8-3 | Riverfront Stadium (1-1) | 23-10 | |
| » W: Fred Norman (3-2) L: Jerry Reuss (0-5) S: Pedro Borbon (1) | First | -- |
| Thursday, May 19 |
| » Defeated Dodgers (28-9), 6-5 | Three Rivers Stadium (13-5) | 24-10 | |
| » W: Rich Gossage (4-0) L: Charlie Hough (3-2) | First | -- |
| Friday, May 20 |
| » Lost to Dodgers (29-9), 6-1 | Three Rivers Stadium (13-6) | 24-11 | |
| » W: Burt Hooton (4-1) L: Larry Demery (3-2) | First | -- |
| Saturday, May 21 |
| » Lost to Dodgers (30-9), 4-3 | Three Rivers Stadium (13-7) | 24-12 | Lost 2 |
| » W: Tommy John (4-2) L: Jim Rooker (4-2) | First | -- |
| Sunday, May 22 |
| » Defeated Dodgers (30-10), 11-4 | Three Rivers Stadium (14-7) | 25-12 | |
| » W: John Candelaria (6-0) L: Don Sutton (6-1) | First | -- |
| Tuesday, May 24 |
| » Defeated Mets (15-25), 5-2 | Three Rivers Stadium (15-7) | 26-12 | Won 2 |
| » W: Jerry Reuss (1-5) L: Jon Matlack (3-5) S: Terry Forster (1) | First | -- |
| Wednesday, May 25 |
| » Major-league debuts: Tom Hume (Reds) |
| Friday, May 27 |
| » Lost to Cubs (26-14), 4-2 | Wrigley Field (0-1) | 26-13 | |
| » W: Bill Bonham (6-3) L: John Candelaria (6-1) S: Bruce Sutter (12) | First | -- |
| Saturday, May 28 |
| » Lost to Cubs (27-14), 6-3 | Wrigley Field (0-2) | 26-14 | Lost 2 |
| » W: Paul Reuschel (2-0) L: Jim Rooker (4-3) S: Bruce Sutter (13) | Second | ½ out |
| Future Pirate Alex Hernandez is born in San Juan, P.R. |
| Sunday, May 29 |
| » Lost to Cubs (28-14), 3-2 | Wrigley Field (0-3) | 26-15 | Lost 3 |
| » W: Guillermo Hernandez (1-1) L: Rich Gossage (4-1) S: Bruce Sutter (14) | Second | 1½ out |
| Monday, May 30 |
| » Lost to Phillies (24-19), 6-4 | Veteran's Stadium (0-1) | 26-16 | Lost 4 |
| » W: Steve Carlton (7-2) L: Bruce Kison (3-3) | Second | 1½ out |
| Tuesday, May 31 |
| » Lost to Phillies (25-19), 6-5 | Veteran's Stadium (0-2) | 26-17 | Lost 5 |
| » W: Ron Reed (4-2) L: Kent Tekulve (3-1) | Third | 1½ out |
| Wednesday, June 1 |
| » Defeated Phillies (25-20), 3-0 | Veteran's Stadium (1-2) | 27-17 | |
| » W: John Candelaria (7-1) L: Larry Christenson (4-5) | Second | 1½ out |
| Friday, June 3 |
| » Defeated Cubs (29-17), 5-0 | Three Rivers Stadium (16-7) | 28-17 | Won 2 |
| » W: Jim Rooker (5-3) L: Ray Burris (7-5) | Second | ½ out |
| Saturday, June 4 |
| » Lost to Cubs (30-17), 4-3 | Three Rivers Stadium (16-8) | 28-18 | |
| » W: Mike Krukow (5-3) L: Jerry Reuss (1-6) S: Bruce Sutter (15) | Second | 1½ out |
| Sunday, June 5 |
| » Defeated Cubs (30-18), 5-4 | Three Rivers Stadium (17-8) | 29-18 | |
| » W: Odell Jones (2-1) L: Bill Bonham (6-5) S: Rich Gossage (9) | Second | ½ out |
| Monday, June 6 |
| » Lost to Giants (24-30), 3-1 | Three Rivers Stadium (17-9) | 29-19 | |
| » W: Gary Lavelle (5-2) L: Rich Gossage (4-2) | Second | 1½ out |
| Tuesday, June 7 |
| » Lost to Giants (25-30), 7-6 | Three Rivers Stadium (17-10) | 29-20 | Lost 2 |
| » W: Jim Barr (7-5) L: Larry Demery (3-3) S: Randy Moffitt (5) | Second | 2½ out |
| Wednesday, June 8 |
| » Lost to Giants (26-30), 3-2 | Three Rivers Stadium (17-11) | 29-21 | Lost 3 |
| » W: Jack Curtis (2-1) L: Jim Rooker (5-4) S: Gary Lavelle (8) | Second | 2½ out |
| Friday, June 10 |
| » Defeated Padres (26-34), 10-7 | Three Rivers Stadium (18-11) | 30-21 | |
| » W: Rich Gossage (5-2) L: Rollie Fingers (4-2) | Second | 3 out |
| Saturday, June 11 |
| » Lost to Padres (27-34), 4-1 | Three Rivers Stadium (18-12) | 30-22 | |
| » W: Bob Shirley (5-6) L: John Candelaria (7-2) S: Rollie Fingers (15) | Second | 4 out |
| Sunday, June 12 |
| » Defeated Padres (27-35), 6-1 | Three Rivers Stadium (19-12) | 31-22 | |
| » W: Jerry Reuss (2-6) L: Randy Jones (4-7) | Second | 3½ out |
| » Defeated Padres (27-36), 7-4 | Three Rivers Stadium (20-12) | 32-22 | Won 2 |
| » W: Bruce Kison (4-3) L: Rick Sawyer (4-5) S: Rich Gossage (10) | Second | 3½ out |
| Tuesday, June 14 |
| » Lost to Dodgers (39-21), 3-2 | Dodger Stadium (0-1) | 32-23 | |
| » W: Stan Wall (2-2) L: Rich Gossage (5-3) | Second | 4½ out |
| Wednesday, June 15 |
| » Lost to Dodgers (40-21), 10-1 | Dodger Stadium (0-2) | 32-24 | Lost 2 |
| » W: Rick Rhoden (9-3) L: Odell Jones (2-2) | Third | 5½ out |
| Thursday, June 16 |
| » Lost to Dodgers (41-21), 3-2 | Dodger Stadium (0-3) | 32-25 | Lost 3 |
| » W: Charlie Hough (4-4) L: Rich Gossage (5-4) | Third | 5½ out |
| Friday, June 17 |
| » Lost to Giants (29-35), 4-3 | Candlestick Park (0-1) | 32-26 | Lost 4 |
| » W: Dave Heaverlo (1-0) L: Jerry Reuss (2-7) S: Gary Lavelle (9) | Third | 6½ out |
| Saturday, June 18 |
| » Lost to Giants (30-35), 7-5 | Candlestick Park (0-2) | 32-27 | Lost 5 |
| » W: Randy Moffitt (2-4) L: Terry Forster (1-1) | Third | 6½ out |
| Sunday, June 19 |
| » Lost to Giants (31-35), 8-0 | Candlestick Park (0-3) | 32-28 | Lost 6 |
| » W: Bob Knepper (1-1) L: Jim Rooker (5-5) | Fourth | 7 out |
| » Lost to Giants (32-35), 8-6 | Candlestick Park (0-4) | 32-29 | Lost 7 |
| » W: Dave Heaverlo (2-0) L: Grant Jackson (0-1) S: Randy Moffitt (6) | Fourth | 7 out |
| Monday, June 20 |
| » Defeated Padres (31-39), 5-3 | San Diego/Jack Murphy Stadium (1-0) | 33-29 | |
| » W: Kent Tekulve (4-1) L: Bob Shirley (6-7) S: Rich Gossage (11) | Third | 7 out |
| Tuesday, June 21 |
| » Defeated Padres (31-40), 9-2 | San Diego/Jack Murphy Stadium (2-0) | 34-29 | Won 2 |
| » W: John Candelaria (8-2) L: Dave Tomlin (1-4) | Third | 7 out |
| Wednesday, June 22 |
| » Defeated Padres (31-41), 3-1 | San Diego/Jack Murphy Stadium (3-0) | 35-29 | Won 3 |
| » W: Jerry Reuss (3-7) L: Tom Griffin (5-5) S: Rich Gossage (12) | Third | 7 out |
| Friday, June 24 |
| » Defeated Expos (28-37), 6-5 | Three Rivers Stadium (21-12) | 36-29 | Won 4 |
| » W: Rich Gossage (6-4) L: Joe Kerrigan (1-2) | Second | 7 out |
| Saturday, June 25 |
| » Defeated Expos (28-38), 10-2 | Three Rivers Stadium (22-12) | 37-29 | Won 5 |
| » W: Bruce Kison (5-3) L: Jackie Brown (4-6) | Second | 7 out |
| Sunday, June 26 |
| » Defeated Expos (28-39), 7-4 | Three Rivers Stadium (23-12) | 38-29 | Won 6 |
| » W: Kent Tekulve (5-1) L: Steve Rogers (9-6) S: Rich Gossage (13) | Second | 7½ out |
| » Lost to Expos (29-39), 6-3 | Three Rivers Stadium (23-13) | 38-30 | |
| » W: Will McEnaney (2-1) L: Rich Gossage (6-5) | Second | 7½ out |
| Monday, June 27 |
| » Lost to Cardinals (38-32), 6-1 | Busch Stadium II (2-2) | 38-31 | Lost 2 |
| » W: Pete Falcone (3-6) L: Jerry Reuss (3-8) | Second | 8½ out |
| Tuesday, June 28 |
| » Lost to Cardinals (39-32), 6-1 | Busch Stadium II (2-3) | 38-32 | Lost 3 |
| » W: Buddy Schultz (4-1) L: Terry Forster (1-2) | Fourth | 10 out |
| » Lost to Cardinals (40-32), 13-3 | Busch Stadium II (2-4) | 38-33 | Lost 4 |
| » W: Tom Underwood (4-3) L: Grant Jackson (0-2) | Fourth | 10 out |
| Wednesday, June 29 |
| » Defeated Cardinals (40-33), 9-1 | Busch Stadium II (3-4) | 39-33 | |
| » W: Bruce Kison (6-3) L: Eric Rasmussen (6-9) | Fourth | 9 out |
| Future Pirate Tony McKnight is born in Texarkana, AR. |
| Thursday, June 30 |
| » Lost to Phillies (40-32), 8-1 | Veteran's Stadium (1-3) | 39-34 | |
| » W: Steve Carlton (10-4) L: Odell Jones (2-3) | Fourth | 9 out |
| Friday, July 1 |
| » Lost to Phillies (41-32), 7-6 | Veteran's Stadium (1-4) | 39-35 | Lost 2 |
| » W: Gene Garber (3-4) L: Grant Jackson (0-3) | Fourth | 9 out |
| Saturday, July 2 |
| » Lost to Phillies (42-32), 4-3 | Veteran's Stadium (1-5) | 39-36 | Lost 3 |
| » W: Warren Brusstar (2-1) L: Jerry Reuss (3-9) S: Ron Reed (7) | Fourth | 9 out |
| Sunday, July 3 |
| » Lost to Phillies (43-32), 11-7 | Veteran's Stadium (1-6) | 39-37 | Lost 4 |
| » W: Larry Christenson (7-5) L: Bruce Kison (6-4) | Fourth | 10 out |
| Monday, July 4 |
| » Defeated Cardinals (43-35), 5-2 | Three Rivers Stadium (24-13) | 40-37 | |
| » W: Jim Rooker (6-5) L: Tom Underwood (4-4) S: Rich Gossage (14) | Fourth | 8 out |
| » Defeated Cardinals (43-36), 4-3 | Three Rivers Stadium (25-13) | 41-37 | Won 2 |
| » W: Kent Tekulve (6-1) L: Rawly Eastwick (3-3) | Fourth | 8 out |
| Tuesday, July 5 |
| » Lost to Cardinals (44-36), 7-3 | Three Rivers Stadium (25-14) | 41-38 | |
| » W: Bob Forsch (10-4) L: John Candelaria (8-3) | Fourth | 8 out |
| Wednesday, July 6 |
| » Defeated Cardinals (44-37), 11-8 | Three Rivers Stadium (26-14) | 42-38 | |
| » W: Kent Tekulve (7-1) L: Al Hrabosky (2-3) | Fourth | 8 out |
| Friday, July 8 |
| » Defeated Phillies (47-33), 8-7 | Three Rivers Stadium (27-14) | 43-38 | Won 2 |
| » W: Rich Gossage (7-5) L: Warren Brusstar (3-2) | Third | 8½ out |
| Saturday, July 9 |
| » Defeated Phillies (47-34), 9-8 | Three Rivers Stadium (28-14) | 44-38 | Won 3 |
| » W: Terry Forster (2-2) L: Gene Garber (4-5) | Third | 7½ out |
| Sunday, July 10 |
| » Defeated Phillies (47-35), 5-1 | Three Rivers Stadium (29-14) | 45-38 | Won 4 |
| » W: Jerry Reuss (4-9) L: Jim Lonborg (2-3) | Third | 6½ out |
| » Defeated Phillies (47-36), 12-10 | Three Rivers Stadium (30-14) | 46-38 | Won 5 |
| » W: Grant Jackson (1-3) L: Ron Reed (6-3) S: Rich Gossage (15) | Third | 6½ out |
| Monday, July 11 |
| » Lost to Expos (39-45), 4-2 | Stade Olympique (1-3) | 46-39 | |
| » W: Stan Bahnsen (5-4) L: Odell Jones (2-4) | Third | 7 out |
| Tuesday, July 12 |
| » Defeated Expos (39-46), 5-4 | Stade Olympique (2-3) | 47-39 | |
| » W: Rich Gossage (8-5) L: Bill Atkinson (4-2) | Third | 6 out |
| Wednesday, July 13 |
| » Defeated Expos (39-47), 6-1 | Stade Olympique (3-3) | 48-39 | Won 2 |
| » W: John Candelaria (9-3) L: Steve Rogers (9-8) | Third | 5½ out |
| Friday, July 15 |
| » Defeated Mets (34-54), 7-1 | Shea Stadium (3-0) | 49-39 | Won 3 |
| » W: Jim Rooker (7-5) L: Pat Zachry (4-10) | Third | 4½ out |
| » Lost to Mets (35-54), 6-1 | Shea Stadium (3-1) | 49-40 | |
| » W: Nino Espinosa (5-7) L: Jerry Reuss (4-10) | Third | 4½ out |
| Saturday, July 16 |
| » Lost to Mets (36-54), 5-3 | Shea Stadium (3-2) | 49-41 | Lost 2 |
| » W: Craig Swan (5-6) L: Rich Gossage (8-6) S: Bob Apodaca (2) | Third | 5½ out |
| Sunday, July 17 |
| » Defeated Mets (36-55), 3-1 | Shea Stadium (4-2) | 50-41 | |
| » W: John Candelaria (10-3) L: Jon Matlack (4-12) S: Rich Gossage (16) | Third | 5 out |
| » Lost to Mets (37-55), 9-3 | Shea Stadium (4-3) | 50-42 | |
| » W: Jerry Koosman (7-11) L: Terry Forster (2-3) | Third | 5 out |
| Thursday, July 21 |
| » Defeated Reds (48-42), 6-2 | Three Rivers Stadium (31-14) | 51-42 | |
| » W: Jerry Reuss (5-10) L: Fred Norman (9-6) | Third | 5 out |
| » Major-league debuts: Mario Soto (Reds) |
| Friday, July 22 |
| » Defeated Reds (48-43), 8-7 | Three Rivers Stadium (32-14) | 52-42 | Won 2 |
| » W: Grant Jackson (2-3) L: Jack Billingham (8-6) | Third | 5 out |
| Future Pirate Ryan Vogelsong is born in Charlotte, NC. |
| Saturday, July 23 |
| » Defeated Reds (48-44), 5-4 | Three Rivers Stadium (33-14) | 53-42 | Won 3 |
| » W: Jim Rooker (8-5) L: Doug Capilla (2-2) S: Grant Jackson (2) | Third | 4 out |
| Sunday, July 24 |
| » Defeated Braves (35-60), 7-6 | Three Rivers Stadium (34-14) | 54-42 | Won 4 |
| » W: Kent Tekulve (8-1) L: Steve Hargan (2-5) | Third | 2½ out |
| Monday, July 25 |
| » Defeated Braves (35-61), 6-3 | Three Rivers Stadium (35-14) | 55-42 | Won 5 |
| » W: Jerry Reuss (6-10) L: Phil Niekro (9-12) | Third | 2½ out |
| Tuesday, July 26 |
| » Defeated Astros (46-54), 3-2 | Three Rivers Stadium (36-14) | 56-42 | Won 6 |
| » W: John Candelaria (11-3) L: J.R. Richard (9-8) S: Rich Gossage (17) | Third | 2½ out |
| Wednesday, July 27 |
| » Defeated Astros (46-55), 3-2 | Three Rivers Stadium (37-14) | 57-42 | Won 7 |
| » W: Kent Tekulve (9-1) L: Bo McLaughlin (3-5) | Third | 2 out |
| Thursday, July 28 |
| » Defeated Astros (46-56), 9-4 | Three Rivers Stadium (38-14) | 58-42 | Won 8 |
| » W: Jim Rooker (9-5) L: Dan Larson (0-4) | Second | 2 out |
| Friday, July 29 |
| » Lost to Braves (36-64), 5-3 | Atlanta-Fulton County Stadium (3-1) | 58-43 | |
| » W: Phil Niekro (10-12) L: Bruce Kison (6-5) | Second | 2 out |
| Saturday, July 30 |
| » Defeated Braves (36-65), 10-6 | Atlanta-Fulton County Stadium (4-1) | 59-43 | |
| » W: Terry Forster (3-3) L: Don Collins (1-9) | Second | 1 out |
| Sunday, July 31 |
| » Lost to Braves (37-65), 8-3 | Atlanta-Fulton County Stadium (4-2) | 59-44 | |
| » W: Eddie Solomon (2-1) L: John Candelaria (11-4) S: Preston Hanna (1) | Third | 2 out |
| Monday, August 1 |
| » Lost to Astros (49-57), 4-3 | Astrodome (2-2) | 59-45 | Lost 2 |
| » W: Mark Lemongello (4-12) L: Rich Gossage (8-7) | Third | 2 out |
| Tuesday, August 2 |
| » Defeated Astros (49-58), 6-3 | Astrodome (3-2) | 60-45 | |
| » W: Grant Jackson (3-3) L: Dan Larson (0-5) | Third | 2 out |
| Wednesday, August 3 |
| » Lost to Astros (50-58), 3-0 | Astrodome (3-3) | 60-46 | |
| » W: Joe Niekro (7-3) L: Bruce Kison (6-6) | Third | 2 out |
| Friday, August 5 |
| » Defeated Reds (53-53), 12-1 | Riverfront Stadium (2-1) | 61-46 | |
| » W: Jerry Reuss (7-10) L: Fred Norman (9-9) | Third | 1 out |
| » Defeated Reds (53-54), 10-6 | Riverfront Stadium (3-1) | 62-46 | Won 2 |
| » W: Grant Jackson (4-3) L: Doug Capilla (3-4) | Third | 1 out |
| Saturday, August 6 |
| » Lost to Reds (54-54), 8-3 | Riverfront Stadium (3-2) | 62-47 | |
| » W: Tom Seaver (11-5) L: Terry Forster (3-4) | Third | 2 out |
| Sunday, August 7 |
| » Lost to Reds (55-54), 6-0 | Riverfront Stadium (3-3) | 62-48 | Lost 2 |
| » W: Mario Soto (2-1) L: Jim Rooker (9-6) | Third | 3 out |
| Monday, August 8 |
| » Defeated Cubs (64-46), 7-6 | Three Rivers Stadium (39-14) | 63-48 | |
| » W: Grant Jackson (5-3) L: Rick Reuschel (15-4) | Third | 2½ out |
| Tuesday, August 9 |
| » Lost to Cubs (65-46), 4-1 | Three Rivers Stadium (39-15) | 63-49 | |
| » W: Ray Burris (12-11) L: Jerry Reuss (7-11) S: Guillermo Hernandez (3) | Third | 3 out |
| Wednesday, August 10 |
| » Defeated Cubs (65-47), 2-1 | Three Rivers Stadium (40-15) | 64-49 | |
| » W: Larry Demery (4-3) L: Pete Broberg (1-1) | Third | 3½ out |
| Thursday, August 11 |
| » Defeated Mets (47-65), 9-1 | Three Rivers Stadium (41-15) | 65-49 | Won 2 |
| » W: Odell Jones (3-4) L: Pat Zachry (5-12) | Third | 3½ out |
| Friday, August 12 |
| » Defeated Mets (47-66), 3-2 | Three Rivers Stadium (42-15) | 66-49 | Won 3 |
| » W: Jim Rooker (10-6) L: Jerry Koosman (8-14) | Second | 3 out |
| » Defeated Mets (47-67), 6-5 | Three Rivers Stadium (43-15) | 67-49 | Won 4 |
| » W: Larry Demery (5-3) L: Paul Siebert (2-1) | Second | 3 out |
| Saturday, August 13 |
| » Defeated Mets (47-68), 2-0 | Three Rivers Stadium (44-15) | 68-49 | Won 5 |
| » W: Jerry Reuss (8-11) L: Jon Matlack (6-13) | Second | 3 out |
| Sunday, August 14 |
| » Defeated Mets (47-69), 6-3 | Three Rivers Stadium (45-15) | 69-49 | Won 6 |
| » W: John Candelaria (12-4) L: Nino Espinosa (6-9) S: Kent Tekulve (4) | Second | 3½ out |
| Tuesday, August 16 |
| » Lost to Cubs (66-51), 6-5 | Wrigley Field (0-4) | 69-50 | |
| » W: Guillermo Hernandez (6-4) L: Larry Demery (5-4) | Second | 4½ out |
| Former Pirate Joe Kelly dies in St.Joseph, MO at the age of 91. |
| Wednesday, August 17 |
| » Lost to Cubs (67-51), 4-2 | Wrigley Field (0-5) | 69-51 | Lost 2 |
| » W: Rick Reuschel (16-5) L: Jim Rooker (10-7) | Second | 4½ out |
| Thursday, August 18 |
| » Defeated Cubs (67-52), 7-6 | Wrigley Field (1-5) | 70-51 | |
| » W: Jerry Reuss (9-11) L: Ray Burris (12-12) S: Kent Tekulve (5) | Second | 4½ out |
| Friday, August 19 |
| » Defeated Giants (55-68), 6-1 | Three Rivers Stadium (46-15) | 71-51 | Won 2 |
| » W: John Candelaria (13-4) L: Bob Knepper (6-7) | Second | 4½ out |
| Former Pirate Bob Klinger dies in Villa Ridge, MO at the age of 70. |
| Saturday, August 20 |
| » Lost to Giants (56-68), 5-1 | Three Rivers Stadium (46-16) | 71-52 | |
| » W: Ed Halicki (11-9) L: Odell Jones (3-5) | Second | 5½ out |
| Sunday, August 21 |
| » Lost to Giants (57-68), 5-4 | Three Rivers Stadium (46-17) | 71-53 | Lost 2 |
| » W: Gary Lavelle (7-7) L: Rich Gossage (8-8) S: Randy Moffitt (9) | Second | 6½ out |
| Monday, August 22 |
| » Lost to Padres (56-72), 1-0 | Three Rivers Stadium (46-18) | 71-54 | Lost 3 |
| » W: Bob Shirley (8-15) L: Jim Rooker (10-8) S: Rollie Fingers (28) | Second | 7½ out |
| » Major-league debuts: Dale Berra (Pirates) |
| Tuesday, August 23 |
| » Defeated Padres (56-73), 7-6 | Three Rivers Stadium (47-18) | 72-54 | |
| » W: Rich Gossage (9-8) L: Rollie Fingers (8-5) | Second | 7½ out |
| Former Pirate Bubber Jonnard dies in New York, NY at the age of 80. |
| Wednesday, August 24 |
| » Lost to Dodgers (75-51), 2-1 | Three Rivers Stadium (47-19) | 72-55 | |
| » W: Tommy John (15-5) L: Rich Gossage (9-9) S: Mike Garman (7) | Second | 7½ out |
| Thursday, August 25 |
| » Defeated Dodgers (75-52), 2-1 | Three Rivers Stadium (48-19) | 73-55 | |
| » W: John Candelaria (14-4) L: Doug Rau (13-4) S: Larry Demery (1) | Second | 6½ out |
| Friday, August 26 |
| » Defeated Padres (56-74), 3-1 | San Diego/Jack Murphy Stadium (4-0) | 74-55 | Won 2 |
| » W: Bruce Kison (7-6) L: Bob Owchinko (6-9) S: Rich Gossage (18) | Second | 5½ out |
| Saturday, August 27 |
| » Defeated Padres (56-75), 4-0 | San Diego/Jack Murphy Stadium (5-0) | 75-55 | Won 3 |
| » W: Jerry Reuss (10-11) L: Randy Jones (5-11) | Second | 4½ out |
| Sunday, August 28 |
| » Defeated Padres (56-76), 10-1 | San Diego/Jack Murphy Stadium (6-0) | 76-55 | Won 4 |
| » W: Jim Rooker (11-8) L: Bob Shirley (8-16) | Second | 3½ out |
| Tuesday, August 30 |
| » Defeated Giants (61-72), 3-1 | Candlestick Park (1-4) | 77-55 | Won 5 |
| » W: John Candelaria (15-4) L: John Montefusco (7-10) | Second | 4 out |
| Wednesday, August 31 |
| » Lost to Giants (62-72), 6-3 | Candlestick Park (1-5) | 77-56 | |
| » W: Jim Barr (12-12) L: Bruce Kison (7-7) | Second | 5 out |
| Friday, September 2 |
| » Lost to Dodgers (81-53), 10-2 | Dodger Stadium (0-4) | 77-57 | Lost 2 |
| » W: Burt Hooton (10-7) L: Jerry Reuss (10-12) | Second | 6 out |
| » Major-league debuts: Jeffrey Leonard (Dodgers) |
| Future Pirate Yamid Haad is born in Cartagena, Colombia. |
| Saturday, September 3 |
| » Lost to Dodgers (82-53), 6-4 | Dodger Stadium (0-5) | 77-58 | Lost 3 |
| » W: Don Sutton (13-8) L: Jim Rooker (11-9) S: Mike Garman (10) | Second | 7 out |
| Sunday, September 4 |
| » Lost to Dodgers (83-53), 8-2 | Dodger Stadium (0-6) | 77-59 | Lost 4 |
| » W: Tommy John (17-5) L: Odell Jones (3-6) | Second | 7 out |
| » Major-league debuts: Tim Jones and Ed Whitson (Pirates) |
| Monday, September 5 |
| » Defeated Phillies (83-52), 3-1 | Three Rivers Stadium (49-19) | 78-59 | |
| » W: John Candelaria (16-4) L: Randy Lerch (7-5) S: Rich Gossage (19) | Second | 7 out |
| » Lost to Phillies (84-52), 11-1 | Three Rivers Stadium (49-20) | 78-60 | |
| » W: Steve Carlton (20-8) L: Bruce Kison (7-8) | Second | 7 out |
| » Major-league debuts: Al Holland (Pirates) |
| Tuesday, September 6 |
| » Defeated Phillies (84-53), 5-4 | Three Rivers Stadium (50-20) | 79-60 | |
| » W: Rich Gossage (10-9) L: Gene Garber (7-6) | Second | 6 out |
| Wednesday, September 7 |
| » Defeated Cardinals (74-65), 5-4 | Three Rivers Stadium (51-20) | 80-60 | Won 2 |
| » W: Terry Forster (4-4) L: John Denny (7-6) S: Kent Tekulve (6) | Second | 6 out |
| Thursday, September 8 |
| » Defeated Cardinals (74-66), 9-5 | Three Rivers Stadium (52-20) | 81-60 | Won 3 |
| » W: Larry Demery (6-4) L: Rawly Eastwick (5-8) S: Rich Gossage (20) | Second | 6 out |
| Friday, September 9 |
| » Lost to Expos (64-76), 2-1 | Three Rivers Stadium (52-21) | 81-61 | |
| » W: Hal Dues (1-0) L: Odell Jones (3-7) S: Don Stanhouse (8) | Second | 7 out |
| » Major-league debuts: Hal Dues (Expos) |
| Saturday, September 10 |
| » Lost to Expos (65-76), 4-2 | Three Rivers Stadium (52-22) | 81-62 | Lost 2 |
| » W: Wayne Twitchell (5-10) L: John Candelaria (16-5) S: Joe Kerrigan (11) | Second | 8 out |
| » Major-league debuts: Mike Edwards (Pirates) |
| Future Pirate Chad Hermansen is born in Salt Lake City, UT. |
| Sunday, September 11 |
| » Defeated Expos (65-77), 10-4 | Three Rivers Stadium (53-22) | 82-62 | |
| » W: Bruce Kison (8-8) L: Fred Holdsworth (2-3) | Second | 8 out |
| Monday, September 12 |
| » Lost to Phillies (90-53), 6-2 | Veteran's Stadium (1-7) | 82-63 | |
| » W: Larry Christenson (15-6) L: Jerry Reuss (10-13) | Second | 9 out |
| Tuesday, September 13 |
| » Defeated Phillies (90-54), 2-0 | Veteran's Stadium (2-7) | 83-63 | |
| » W: Jim Rooker (12-9) L: Jim Kaat (6-9) S: Rich Gossage (21) |