| Tuesday, January 23 |
| Future Pirate Victor Cole is born in Leningrad, Russia. |
| Wednesday, January 24 |
| Future Pirate Ross Powell is born in Grand Rapids, MI. |
| Friday, January 26 |
| Former Pirate Eddie Phillips dies in Buffalo, NY at the age of 67. |
| Saturday, February 3 |
| Former Pirate Jake Pitler dies in Binghamton, NY at the age of 74. |
| Monday, March 4 |
| Future Pirate Brian Hunter is born in Torrance, CA. |
| Friday, March 8 |
| Future Pirate Jim Dougherty is born in Brentwood, NY. |
| Monday, March 18 |
| Former Pirate Heinie Meine dies in St.Louis, MO at the age of 72. |
| Friday, March 22 |
| Future Pirate Ramon Martinez is born in Santo Domingo, D.R. |
| Wednesday, April 10 |
| » Lost to Astros (1-0), 5-4 | Astrodome (0-1) | 0-1 | |
| » Starters: Jim Bunning vs Larry Dierker | Second | 1 out |
| » Major-league debuts: Hector Torres (Astros) |
| Thursday, April 11 |
| » Defeated Giants (1-1), 3-1 | Candlestick Park (1-0) | 1-1 | |
| » Starters: Bob Veale vs Mike McCormick | Second | 1 out |
| » Major-league debuts: Carl Taylor (Pirates) |
| Saturday, April 13 |
| » Defeated Giants (1-2), 2-1 | Candlestick Park (2-0) | 2-1 | Won 2 |
| » Starters: Al McBean vs Gaylord Perry | Third | 1½ out |
| Sunday, April 14 |
| » Defeated Dodgers (1-3), 3-0 | Dodger Stadium (1-0) | 3-1 | Won 3 |
| » Starters: Jim Bunning vs Claude Osteen | Second | ½ out |
| » Major-league debuts: Jim Fairey (Dodgers) |
| Monday, April 15 |
| » Lost to Dodgers (2-3), 3-2 | Dodger Stadium (1-1) | 3-2 | |
| » Starters: Bob Veale vs Bill Singer | Third | 1½ out |
| » Major-league debuts: Cleo James (Dodgers) |
| Wednesday, April 17 |
| » Defeated Astros (5-2), 13-4 | Forbes Field (1-0) | 4-2 | |
| » Starters: Denny Lemaster vs Al McBean | Second | ½ out |
| Friday, April 19 |
| » Lost to Giants (5-3), 5-2 | Forbes Field (1-1) | 4-3 | |
| » Starters: Juan Marichal vs Jim Bunning | Third | 1 out |
| Saturday, April 20 |
| » Lost to Giants (6-3), 1-0 | Forbes Field (1-2) | 4-4 | Lost 2 |
| » Starters: Ray Sadecki vs Bob Veale | Fourth | 1½ out |
| Sunday, April 21 |
| » Defeated Giants (6-4), 10-0 | Forbes Field (2-2) | 5-4 | |
| » Starters: Mike McCormick vs Al McBean | Third | 1 out |
| Monday, April 22 |
| » Lost to Dodgers (7-5), 5-3 | Forbes Field (2-3) | 5-5 | |
| » Starters: Mudcat Grant vs Tommie Sisk | Fourth | 1½ out |
| Wednesday, April 24 |
| » Defeated Dodgers (7-6), 4-3 | Forbes Field (3-3) | 6-5 | |
| » Starters: Claude Osteen vs Jim Bunning | Third | 2 out |
| Thursday, April 25 |
| Former Pirate Billy Kelsey dies in Springfield, OH at the age of 87. |
| Friday, April 26 |
| » Lost to Cardinals (10-4), 2-1 | Busch Stadium II (0-1) | 6-6 | |
| » Starters: Bob Veale vs Bob Gibson | Fourth | 3 out |
| Saturday, April 27 |
| » Lost to Cardinals (11-4), 7-5 | Busch Stadium II (0-2) | 6-7 | Lost 2 |
| » Starters: Al McBean vs Nelson Briles | Sixth | 4 out |
| Sunday, April 28 |
| » Lost to Cardinals (12-4), 4-2 | Busch Stadium II (0-3) | 6-8 | Lost 3 |
| » Starters: Tommie Sisk vs Steve Carlton | Sixth | 5 out |
| Monday, April 29 |
| » Defeated Cubs (8-9), 7-4 | Forbes Field (4-3) | 7-8 | |
| » Starters: Fergie Jenkins vs Steve Blass | Sixth | 4 out |
| Tuesday, April 30 |
| » Defeated Cubs (8-10), 4-3 | Forbes Field (5-3) | 8-8 | Won 2 |
| » Starters: Bill Hands vs Bob Veale | Third | 4 out |
| Wednesday, May 1 |
| » Defeated Cubs (8-11), 4-0 | Forbes Field (6-3) | 9-8 | Won 3 |
| » Starters: Rich Nye vs Al McBean | Third | 4 out |
| Thursday, May 2 |
| » Lost to Cubs (9-11), 1-0 | Forbes Field (6-4) | 9-9 | |
| » Starters: Joe Niekro vs Jim Bunning | Third | 4 out |
| Friday, May 3 |
| » Lost to Phillies (10-10), 3-2 | Shibe Park (0-1) | 9-10 | Lost 2 |
| » Starters: Steve Blass vs Rick Wise | Fifth | 4 out |
| Future Pirate Ivan Cruz is born in Fajardo, P.R. |
| Saturday, May 4 |
| » Lost to Phillies (11-10), 3-2 | Shibe Park (0-2) | 9-11 | Lost 3 |
| » Starters: Tommie Sisk vs Chris Short | Sixth | 5 out |
| Sunday, May 5 |
| » Defeated Phillies (11-11), 5-2 | Shibe Park (1-2) | 10-11 | |
| » Starters: Luke Walker vs Larry Jackson | Fifth | 4 out |
| Monday, May 6 |
| » Defeated Braves (11-13), 2-1 | Atlanta-Fulton County Stadium (1-0) | 11-11 | Won 2 |
| » Starters: Jim Bunning vs Pat Jarvis | Fourth | 4 out |
| Tuesday, May 7 |
| » Lost to Braves (12-13), 2-1 | Atlanta-Fulton County Stadium (1-1) | 11-12 | |
| » Starters: Al McBean vs Dick Kelley | Fifth | 4 out |
| » Major-league debuts: Skip Guinn (Braves) |
| Wednesday, May 8 |
| » Defeated Braves (12-14), 4-3 | Atlanta-Fulton County Stadium (2-1) | 12-12 | |
| » Starters: Steve Blass vs Phil Niekro | Third | 4 out |
| Thursday, May 9 |
| » Lost to Braves (13-14), 4-2 | Atlanta-Fulton County Stadium (2-2) | 12-13 | |
| » Starters: Bob Moose vs Ron Reed | Fifth | 4½ out |
| Friday, May 10 |
| » Defeated Phillies (14-13), 2-1 | Forbes Field (7-4) | 13-13 | |
| » Starters: Woodie Fryman vs Bob Veale | Third | 4 out |
| Saturday, May 11 |
| Future Pirate Mike Garcia is born in Riverside, CA. |
| Sunday, May 12 |
| » Defeated Phillies (14-14), 2-1 | Forbes Field (8-4) | 14-13 | Won 2 |
| » Starters: Rick Wise vs Al McBean | Second | 3½ out |
| Monday, May 13 |
| » Lost to Cardinals (19-10), 1-0 | Forbes Field (8-5) | 14-14 | |
| » Starters: Nelson Briles vs Jim Bunning | Fourth | 4½ out |
| Wednesday, May 15 |
| » Lost to Cardinals (20-10), 1-0 | Forbes Field (8-6) | 14-15 | Lost 2 |
| » Starters: Steve Carlton vs Steve Blass | Sixth | 5½ out |
| Thursday, May 16 |
| » Defeated Cardinals (20-11), 3-0 | Forbes Field (9-6) | 15-15 | |
| » Starters: Ray Washburn vs Bob Veale | Fourth | 4½ out |
| Friday, May 17 |
| » Lost to Reds (16-17), 3-2 | Forbes Field (9-7) | 15-16 | |
| » Starters: Jim Maloney vs Al McBean | Sixth | 4½ out |
| Saturday, May 18 |
| » Lost to Reds (17-17), 8-3 | Forbes Field (9-8) | 15-17 | Lost 2 |
| » Starters: Mel Queen vs Jim Bunning | Eighth | 4½ out |
| Sunday, May 19 |
| » Lost to Reds (18-17), 9-3 | Forbes Field (9-9) | 15-18 | Lost 3 |
| » Starters: George Culver vs Steve Blass | Seventh | 4½ out |
| Monday, May 20 |
| » Lost to Mets (16-20), 2-1 | Shea Stadium (0-1) | 15-19 | Lost 4 |
| » Starters: Bob Veale vs Jerry Koosman | Ninth | 5½ out |
| Tuesday, May 21 |
| » Lost to Mets (17-20), 4-3 | Shea Stadium (0-2) | 15-20 | Lost 5 |
| » Starters: Al McBean vs Tom Seaver | Ninth | 5½ out |
| Future Pirate Steve Pegues is born in Pontotoc, MS. |
| Wednesday, May 22 |
| » Defeated Cubs (20-20), 13-6 | Wrigley Field (1-0) | 16-20 | |
| » Starters: Jim Bunning vs Joe Niekro | Ninth | 4½ out |
| Friday, May 24 |
| » Defeated Reds (19-20), 8-5 | Crosley Field (1-0) | 17-20 | Won 2 |
| » Starters: Steve Blass vs George Culver | Eighth | 5 out |
| Saturday, May 25 |
| » Defeated Reds (19-21), 5-4 | Crosley Field (2-0) | 18-20 | Won 3 |
| » Starters: Bob Veale vs Gerry Arrigo | Eighth | 4 out |
| Future Pirate Will Pennyfeather is born in Perth Amboy, NJ. |
| Sunday, May 26 |
| » Tied Reds, 8-8 | Crosley Field (2-0) | 18-20 | |
| » Starters: Al McBean vs Mel Queen | Eighth | 3½ out |
| Thursday, May 30 |
| » Lost to Mets (19-23), 6-3 | Forbes Field (9-10) | 18-21 | |
| » Starters: Jerry Koosman vs Jim Bunning | Tenth | 5 out |
| » Lost to Mets (20-23), 5-4 | Forbes Field (9-11) | 18-22 | Lost 2 |
| » Starters: Dick Selma vs Bob Veale | Tenth | 5 out |
| Friday, May 31 |
| » Lost to Braves (25-21), 5-2 | Forbes Field (9-12) | 18-23 | Lost 3 |
| » Starters: Phil Niekro vs Al McBean | Tenth | 5 out |
| Sunday, June 2 |
| » Defeated Braves (25-22), 8-4 | Forbes Field (10-12) | 19-23 | |
| » Starters: Dick Kelley vs Tommie Sisk | Ninth | 5½ out |
| » Lost to Braves (26-22), 10-5 | Forbes Field (10-13) | 19-24 | |
| » Starters: Pat Jarvis vs Steve Blass | Ninth | 5½ out |
| Monday, June 3 |
| » Lost to Dodgers (26-26), 2-0 | Dodger Stadium (1-2) | 19-25 | Lost 2 |
| » Starters: Bob Veale vs Claude Osteen | Ninth | 6½ out |
| » Major-league debuts: Freddie Patek (Pirates) |
| Tuesday, June 4 |
| » Lost to Dodgers (27-26), 5-0 | Dodger Stadium (1-3) | 19-26 | Lost 3 |
| » Starters: Jim Bunning vs Don Drysdale | Tenth | 7½ out |
| Wednesday, June 5 |
| » Lost to Dodgers (28-26), 2-1 | Dodger Stadium (1-4) | 19-27 | Lost 4 |
| » Starters: Al McBean vs Bill Singer | Tenth | 8½ out |
| Thursday, June 6 |
| » Lost to Dodgers (29-26), 4-2 | Dodger Stadium (1-5) | 19-28 | Lost 5 |
| » Starters: Tommie Sisk vs Don Sutton | Tenth | 9½ out |
| Friday, June 7 |
| » Defeated Astros (21-31), 5-0 | Astrodome (1-1) | 20-28 | |
| » Starters: Steve Blass vs Dave Giusti | Ninth | 8½ out |
| Saturday, June 8 |
| » Lost to Astros (22-31), 3-2 | Astrodome (1-2) | 20-29 | |
| » Starters: Jim Bunning vs Denny Lemaster | Tenth | 9½ out |
| Sunday, June 9 |
| » Defeated Astros (22-32), 3-1 | Astrodome (2-2) | 21-29 | |
| » Starters: Bob Moose vs Mike Cuellar | Ninth | 9 out |
| Monday, June 10 |
| » Lost to Giants (31-26), 8-0 | Candlestick Park (2-1) | 21-30 | |
| » Starters: Bob Veale vs Juan Marichal | Ninth | 10 out |
| Tuesday, June 11 |
| » Defeated Giants (31-27), 7-4 | Candlestick Park (3-1) | 22-30 | |
| » Starters: Steve Blass vs Ray Sadecki | Ninth | 10 out |
| Former Pirate Bill Regan dies in Pittsburgh, PA at the age of 70. |
| Wednesday, June 12 |
| » Lost to Giants (32-27), 4-2 | Candlestick Park (3-2) | 22-31 | |
| » Starters: Jim Bunning vs Bobby Bolin | Tenth | 10 out |
| Thursday, June 13 |
| » Defeated Giants (32-28), 8-7 | Candlestick Park (4-2) | 23-31 | |
| » Starters: Al McBean vs Gaylord Perry | Ninth | 10 out |
| Friday, June 14 |
| » Defeated Astros (23-34), 3-0 | Forbes Field (11-13) | 24-31 | Won 2 |
| » Starters: Denny Lemaster vs Bob Moose | Eighth | 9 out |
| Saturday, June 15 |
| » Defeated Astros (23-35), 13-2 | Forbes Field (12-13) | 25-31 | Won 3 |
| » Starters: Don Wilson vs Bob Veale | Ninth | 9 out |
| Sunday, June 16 |
| » Defeated Astros (23-36), 3-1 | Forbes Field (13-13) | 26-31 | Won 4 |
| » Starters: Mike Cuellar vs Steve Blass | Eighth | 8½ out |
| » Defeated Astros (23-37), 11-2 | Forbes Field (14-13) | 27-31 | Won 5 |
| » Starters: Larry Dierker vs Tommie Sisk | Eighth | 8½ out |
| Monday, June 17 |
| » Defeated Astros (23-38), 4-3 | Forbes Field (15-13) | 28-31 | Won 6 |
| » Starters: Dave Giusti vs Al McBean | Eighth | 8 out |
| Tuesday, June 18 |
| » Defeated Dodgers (34-32), 3-2 | Forbes Field (16-13) | 29-31 | Won 7 |
| » Starters: Don Drysdale vs Bob Moose | Sixth | 8 out |
| » Major-league debuts: Dock Ellis (Pirates) |
| Wednesday, June 19 |
| » Defeated Dodgers (34-33), 2-1 | Forbes Field (17-13) | 30-31 | Won 8 |
| » Starters: Bill Singer vs Bob Veale | Sixth | 8 out |
| Thursday, June 20 |
| » Defeated Dodgers (34-34), 7-3 | Forbes Field (18-13) | 31-31 | Won 9 |
| » Starters: Don Sutton vs Steve Blass | Sixth | 8½ out |
| » Lost to Dodgers (35-34), 3-2 | Forbes Field (18-14) | 31-32 | |
| » Starters: Mike Kekich vs Tommie Sisk | Sixth | 8½ out |
| Friday, June 21 |
| » Lost to Giants (36-33), 3-0 | Forbes Field (18-15) | 31-33 | Lost 2 |
| » Starters: Bobby Bolin vs Al McBean | Seventh | 9½ out |
| Saturday, June 22 |
| » Lost to Giants (37-33), 10-3 | Forbes Field (18-16) | 31-34 | Lost 3 |
| » Starters: Mike McCormick vs Bob Moose | Seventh | 10½ out |
| Sunday, June 23 |
| » Lost to Giants (38-33), 2-1 | Forbes Field (18-17) | 31-35 | Lost 4 |
| » Starters: Juan Marichal vs Jim Bunning | Eighth | 11 out |
| Tuesday, June 25 |
| » Defeated Cardinals (44-27), 3-2 | Busch Stadium II (1-3) | 32-35 | |
| » Starters: Bob Veale vs Steve Carlton | Eighth | 10 out |
| Wednesday, June 26 |
| » Lost to Cardinals (45-27), 3-0 | Busch Stadium II (1-4) | 32-36 | |
| » Starters: Al McBean vs Bob Gibson | Eighth | 10 out |
| » Defeated Cardinals (45-28), 3-1 | Busch Stadium II (2-4) | 33-36 | |
| » Starters: Steve Blass vs Larry Jaster | Eighth | 10 out |
| Friday, June 28 |
| » Defeated Phillies (33-34), 10-1 | Shibe Park (2-2) | 34-36 | Won 2 |
| » Starters: Jim Bunning vs Woodie Fryman | Sixth | 10 out |
| Saturday, June 29 |
| » Defeated Phillies (33-35), 1-0 | Shibe Park (3-2) | 35-36 | Won 3 |
| » Starters: Bob Moose vs Larry Jackson | Fifth | 9 out |
| Sunday, June 30 |
| » Defeated Phillies (33-36), 5-2 | Shibe Park (4-2) | 36-36 | Won 4 |
| » Starters: Bob Veale vs Jeff James | Fifth | 8 out |
| Tuesday, July 2 |
| » Defeated Mets (36-39), 2-1 | Shea Stadium (1-2) | 37-36 | Won 5 |
| » Starters: Al McBean vs Dick Selma | Fourth | 8½ out |
| Wednesday, July 3 |
| » Defeated Mets (36-40), 8-1 | Shea Stadium (2-2) | 38-36 | Won 6 |
| » Starters: Steve Blass vs Nolan Ryan | Third | 8½ out |
| Thursday, July 4 |
| » Defeated Mets (36-41), 3-2 | Shea Stadium (3-2) | 39-36 | Won 7 |
| » Starters: Bob Moose vs Jerry Koosman | Fifth | 9 out |
| » Lost to Mets (37-41), 4-3 | Shea Stadium (3-3) | 39-37 | |
| » Starters: Jim Bunning vs Don Cardwell | Fifth | 9 out |
| Friday, July 5 |
| » Defeated Cubs (35-45), 4-0 | Wrigley Field (2-0) | 40-37 | |
| » Starters: Bob Veale vs Rich Nye | Third | 9 out |
| Saturday, July 6 |
| » Lost to Cubs (36-45), 6-1 | Wrigley Field (2-1) | 40-38 | |
| » Starters: Luke Walker vs Fergie Jenkins | Fifth | 10½ out |
| » Lost to Cubs (37-45), 10-2 | Wrigley Field (2-2) | 40-39 | Lost 2 |
| » Starters: Tommie Sisk vs Gary Ross | Fifth | 10½ out |
| Sunday, July 7 |
| » Lost to Cubs (38-45), 5-4 | Wrigley Field (2-3) | 40-40 | Lost 3 |
| » Starters: Steve Blass vs Ken Holtzman | Fifth | 12 out |
| » Lost to Cubs (39-45), 4-3 | Wrigley Field (2-4) | 40-41 | Lost 4 |
| » Starters: Al McBean vs Bill Hands | Fifth | 12 out |
| Thursday, July 11 |
| » Lost to Phillies (39-40), 5-0 | Forbes Field (18-18) | 40-42 | Lost 5 |
| » Starters: Larry Jackson vs Bob Veale | Sixth | 13 out |
| » Lost to Phillies (40-40), 4-1 | Forbes Field (18-19) | 40-43 | Lost 6 |
| » Starters: Chris Short vs Bob Moose | Sixth | 13 out |
| Friday, July 12 |
| » Lost to Phillies (41-40), 3-2 | Forbes Field (18-20) | 40-44 | Lost 7 |
| » Starters: Jeff James vs Jim Bunning | Seventh | 14 out |
| Saturday, July 13 |
| » Lost to Phillies (42-40), 3-2 | Forbes Field (18-21) | 40-45 | Lost 8 |
| » Starters: Woodie Fryman vs Steve Blass | Seventh | 15 out |
| Sunday, July 14 |
| » Lost to Cubs (42-47), 6-2 | Forbes Field (18-22) | 40-46 | Lost 9 |
| » Starters: Joe Niekro vs Al McBean | Eighth | 16 out |
| Monday, July 15 |
| » Lost to Cubs (43-47), 2-1 | Forbes Field (18-23) | 40-47 | Lost 10 |
| » Starters: Fergie Jenkins vs Bob Moose | Eighth | 17 out |
| Tuesday, July 16 |
| » Defeated Mets (41-49), 3-2 | Forbes Field (19-23) | 41-47 | |
| » Starters: Dick Selma vs Bob Veale | Seventh | 17 out |
| Wednesday, July 17 |
| » Defeated Mets (41-50), 8-2 | Forbes Field (20-23) | 42-47 | Won 2 |
| » Starters: Jerry Koosman vs Steve Blass | Seventh | 17 out |
| » Lost to Mets (42-50), 5-4 | Forbes Field (20-24) | 42-48 | |
| » Starters: Don Cardwell vs Tommie Sisk | Seventh | 17 out |
| Thursday, July 18 |
| » Lost to Mets (43-50), 3-0 | Forbes Field (20-25) | 42-49 | Lost 2 |
| » Starters: Tom Seaver vs Al McBean | Seventh | 17 out |
| Friday, July 19 |
| » Defeated Braves (50-42), 2-0 | Atlanta-Fulton County Stadium (3-2) | 43-49 | |
| » Starters: Bob Moose vs Ron Reed | Eighth | 16 out |
| Saturday, July 20 |
| » Defeated Braves (50-43), 2-1 | Atlanta-Fulton County Stadium (4-2) | 44-49 | Won 2 |
| » Starters: Bob Veale vs Phil Niekro | Seventh | 16 out |
| Sunday, July 21 |
| » Defeated Braves (50-44), 6-0 | Atlanta-Fulton County Stadium (5-2) | 45-49 | Won 3 |
| » Starters: Steve Blass vs Milt Pappas | Sixth | 15½ out |
| Tuesday, July 23 |
| » Lost to Reds (47-45), 7-6 | Forbes Field (20-26) | 45-50 | |
| » Starters: Jim Maloney vs Al McBean | Eighth | 17 out |
| Thursday, July 25 |
| » Lost to Reds (48-45), 2-0 | Forbes Field (20-27) | 45-51 | Lost 2 |
| » Starters: George Culver vs Bob Veale | Seventh | 18½ out |
| Friday, July 26 |
| » Lost to Cardinals (66-34), 9-1 | Forbes Field (20-28) | 45-52 | Lost 3 |
| » Starters: Nelson Briles vs Steve Blass | Eighth | 18½ out |
| » Defeated Cardinals (66-35), 5-4 | Forbes Field (21-28) | 46-52 | |
| » Starters: Mel Nelson vs Jim Bunning | Eighth | 18½ out |
| Saturday, July 27 |
| » Lost to Cardinals (67-35), 4-0 | Forbes Field (21-29) | 46-53 | |
| » Starters: Steve Carlton vs Bob Moose | Eighth | 19½ out |
| Former Pirate Babe Adams dies in Silver Spring, MD at the age of 87. |
| Sunday, July 28 |
| » Defeated Cardinals (67-36), 7-1 | Forbes Field (22-29) | 47-53 | |
| » Starters: Larry Jaster vs Al McBean | Eighth | 18½ out |
| Monday, July 29 |
| » Defeated Braves (54-49), 3-2 | Forbes Field (23-29) | 48-53 | Won 2 |
| » Starters: Ron Reed vs Bob Veale | Sixth | 18½ out |
| Tuesday, July 30 |
| » Defeated Braves (54-50), 8-5 | Forbes Field (24-29) | 49-53 | Won 3 |
| » Starters: Ken Johnson vs Steve Blass | Sixth | 18 out |
| » Defeated Braves (54-51), 5-4 | Forbes Field (25-29) | 50-53 | Won 4 |
| » Starters: Phil Niekro vs Jim Bunning | Sixth | 18 out |
| Wednesday, July 31 |
| » Lost to Reds (53-47), 8-2 | Crosley Field (2-1) | 50-54 | |
| » Starters: Bob Moose vs Gerry Arrigo | Sixth | 18½ out |
| » Defeated Reds (53-48), 10-1 | Crosley Field (3-1) | 51-54 | |
| » Starters: Dock Ellis vs Jay Ritchie | Sixth | 18½ out |
| Thursday, August 1 |
| » Defeated Reds (53-49), 6-1 | Crosley Field (4-1) | 52-54 | Won 2 |
| » Starters: Tommie Sisk vs Jim Maloney | Sixth | 18½ out |
| Friday, August 2 |
| » Defeated Giants (53-53), 3-1 | Candlestick Park (5-2) | 53-54 | Won 3 |
| » Starters: Al McBean vs Gaylord Perry | Sixth | 17½ out |
| Saturday, August 3 |
| » Lost to Giants (54-53), 7-0 | Candlestick Park (5-3) | 53-55 | |
| » Starters: Bob Veale vs Ray Sadecki | Fifth | 17½ out |
| Sunday, August 4 |
| » Lost to Giants (55-53), 2-0 | Candlestick Park (5-4) | 53-56 | Lost 2 |
| » Starters: Jim Bunning vs Bobby Bolin | Sixth | 17½ out |
| Monday, August 5 |
| » Lost to Dodgers (50-61), 1-0 | Dodger Stadium (1-6) | 53-57 | Lost 3 |
| » Starters: Steve Blass vs Jack Billingham | Fifth | 18½ out |
| Tuesday, August 6 |
| » Defeated Dodgers (50-62), 4-1 | Dodger Stadium (2-6) | 54-57 | |
| » Starters: Bob Moose vs Don Drysdale | Sixth | 17½ out |
| Wednesday, August 7 |
| » Lost to Dodgers (51-62), 6-2 | Dodger Stadium (2-7) | 54-58 | |
| » Starters: Al McBean vs Don Sutton | Fifth | 18½ out |
| Thursday, August 8 |
| » Defeated Astros (48-65), 4-3 | Astrodome (3-2) | 55-58 | |
| » Starters: Bob Veale vs Mike Cuellar | Sixth | 18½ out |
| Friday, August 9 |
| » Lost to Astros (49-65), 2-1 | Astrodome (3-3) | 55-59 | |
| » Starters: Jim Bunning vs Denny Lemaster | Sixth | 19½ out |
| Saturday, August 10 |
| » Lost to Astros (50-65), 16-3 | Astrodome (3-4) | 55-60 | Lost 2 |
| » Starters: Steve Blass vs John Buzhardt | Sixth | 20 out |
| » Defeated Astros (50-66), 7-4 | Astrodome (4-4) | 56-60 | |
| » Starters: Al McBean vs Dave Giusti | Sixth | 20 out |
| Sunday, August 11 |
| » Lost to Astros (51-66), 5-1 | Astrodome (4-5) | 56-61 | |
| » Starters: Tommie Sisk vs Larry Dierker | Sixth | 20 out |
| Tuesday, August 13 |
| » Lost to Giants (61-56), 3-0 | Forbes Field (25-30) | 56-62 | Lost 2 |
| » Starters: Juan Marichal vs Bob Veale | Sixth | 19½ out |
| Wednesday, August 14 |
| » Lost to Giants (62-56), 2-1 | Forbes Field (25-31) | 56-63 | Lost 3 |
| » Starters: Gaylord Perry vs Dock Ellis | Sixth | 20½ out |
| Thursday, August 15 |
| » Defeated Giants (62-57), 2-0 | Forbes Field (26-31) | 57-63 | |
| » Starters: Bobby Bolin vs Steve Blass | Sixth | 20½ out |
| Friday, August 16 |
| » Lost to Dodgers (54-66), 8-4 | Forbes Field (26-32) | 57-64 | |
| » Starters: Don Drysdale vs Al McBean | Sixth | 20½ out |
| Saturday, August 17 |
| » Defeated Dodgers (54-67), 3-0 | Forbes Field (27-32) | 58-64 | |
| » Starters: Mike Kekich vs Bob Moose | Sixth | 19½ out |
| Sunday, August 18 |
| » Defeated Dodgers (54-68), 5-1 | Forbes Field (28-32) | 59-64 | Won 2 |
| » Starters: Don Sutton vs Bob Veale | Sixth | 19½ out |
| Monday, August 19 |
| » Lost to Reds (64-56), 8-3 | Crosley Field (4-2) | 59-65 | |
| » Starters: Jim Bunning vs Gerry Arrigo | Sixth | 20½ out |
| Tuesday, August 20 |
| » Defeated Reds (64-57), 8-3 | Crosley Field (5-2) | 60-65 | |
| » Starters: Dock Ellis vs Jay Ritchie | Sixth | 19½ out |
| Wednesday, August 21 |
| » Defeated Reds (64-58), 19-1 | Crosley Field (6-2) | 61-65 | Won 2 |
| » Starters: Steve Blass vs Jim Maloney | Sixth | 19½ out |
| Thursday, August 22 |
| » Lost to Reds (65-58), 7-5 | Crosley Field (6-3) | 61-66 | |
| » Starters: Al McBean vs Tony Cloninger | Sixth | 19½ out |
| Former Pirate Heinie Groh dies in Cincinnati, OH at the age of 79. |
| Friday, August 23 |
| » Lost to Cardinals (82-47), 3-2 | Busch Stadium II (2-5) | 61-67 | Lost 2 |
| » Starters: Bob Veale vs Ray Washburn | Sixth | 20½ out |
| Saturday, August 24 |
| » Defeated Cardinals (82-48), 6-4 | Busch Stadium II (3-5) | 62-67 | |
| » Starters: Bob Moose vs Bob Gibson | Sixth | 19½ out |
| Sunday, August 25 |
| » Lost to Cardinals (83-48), 4-2 | Busch Stadium II (3-6) | 62-68 | |
| » Starters: Dock Ellis vs Nelson Briles | Sixth | 20½ out |
| Monday, August 26 |
| » Defeated Braves (64-67), 4-0 | Atlanta-Fulton County Stadium (6-2) | 63-68 | |
| » Starters: Steve Blass vs Milt Pappas | Sixth | 19½ out |
| Tuesday, August 27 |
| » Defeated Braves (64-68), 4-3 | Atlanta-Fulton County Stadium (7-2) | 64-68 | Won 2 |
| » Starters: Jim Bunning vs Ron Reed | Fifth | 18½ out |
| Wednesday, August 28 |
| » Lost to Cardinals (84-50), 8-0 | Forbes Field (28-33) | 64-69 | |
| » Starters: Bob Gibson vs Bob Veale | Sixth | 19½ out |
| Thursday, August 29 |
| » Lost to Cardinals (85-50), 5-0 | Forbes Field (28-34) | 64-70 | Lost 2 |
| » Starters: Ray Washburn vs Bob Moose | Sixth | 20½ out |
| Friday, August 30 |
| » Lost to Braves (68-68), 2-0 | Forbes Field (28-35) | 64-71 | Lost 3 |
| » Starters: Milt Pappas vs Dock Ellis | Sixth | 20½ out |
| Saturday, August 31 |
| » Defeated Braves (68-69), 8-0 | Forbes Field (29-35) | 65-71 | |
| » Starters: Ron Reed vs Steve Blass | Sixth | 20½ out |
| Sunday, September 1 |
| » Lost to Braves (69-69), 8-7 | Forbes Field (29-36) | 65-72 | |
| » Starters: Pat Jarvis vs Jim Bunning | Sixth | 21½ out |
| Monday, September 2 |
| » Defeated Astros (64-75), 6-1 | Forbes Field (30-36) | 66-72 | |
| » Starters: Mike Cuellar vs Bob Veale | Sixth | 21 out |
| » Defeated Astros (64-76), 4-3 | Forbes Field (31-36) | 67-72 | Won 2 |
| » Starters: Dave Giusti vs Bob Moose | Sixth | 21 out |
| Tuesday, September 3 |
| » Defeated Astros (64-77), 3-2 | Forbes Field (32-36) | 68-72 | Won 3 |
| » Starters: Larry Dierker vs Dock Ellis | Sixth | 21 out |
| Friday, September 6 |
| » Defeated Mets (64-80), 2-1 | Forbes Field (33-36) | 69-72 | Won 4 |
| » Starters: Jim McAndrew vs Steve Blass | Sixth | 19 out |
| Future Pirate Pat Meares is born in Salina, KS. |
| Saturday, September 7 |
| » Lost to Mets (65-80), 4-3 | Forbes Field (33-37) | 69-73 | |
| » Starters: Jerry Koosman vs Jim Bunning | Sixth | 19 out |
| Sunday, September 8 |
| » Defeated Mets (65-81), 3-0 | Forbes Field (34-37) | 70-73 | |
| » Starters: Tom Seaver vs Bob Veale | Sixth | 19 out |
| Monday, September 9 |
| » Lost to Phillies (68-76), 8-7 | Forbes Field (34-38) | 70-74 | |
| » Starters: Larry Jackson vs Bob Moose | Sixth | 19 out |
| Tuesday, September 10 |
| » Major-league debuts: John Mayberry (Astros) |
| Wednesday, September 11 |
| » Lost to Phillies (69-76), 8-6 | Forbes Field (34-39) | 70-75 | Lost 2 |
| » Starters: Grant Jackson vs Dock Ellis | Sixth | 19 out |
| » Defeated Phillies (69-77), 6-4 | Forbes Field (35-39) | 71-75 | |
| » Starters: Rick Wise vs Steve Blass | Sixth | 19 out |
| Friday, September 13 |
| » Lost to Mets (67-82), 2-0 | Shea Stadium (3-4) | 71-76 | |
| » Starters: Bob Moose vs Jerry Koosman | Sixth | 19 out |
| Future Pirate Denny Neagle is born in Gambrills, MD. |
| Saturday, September 14 |
| » Defeated Mets (67-83), 6-0 | Shea Stadium (4-4) | 72-76 | |
| » Starters: Bob Veale vs Tom Seaver | Sixth | 19 out |
| Former Pirate Hans Lobert dies in Philadelphia, PA at the age of 87. |
| Sunday, September 15 |
| » Defeated Mets (67-84), 3-0 | Shea Stadium (5-4) | 73-76 | Won 2 |
| » Starters: Steve Blass vs Don Cardwell | Sixth | 19 out |
| Future Pirate Rich Robertson is born in Nacogdoches, TX. |
| Monday, September 16 |
| » Defeated Phillies (71-80), 6-1 | Shibe Park (5-2) | 74-76 | Won 3 |
| » Starters: Dock Ellis vs Rick Wise | Sixth | 18½ out |
| Tuesday, September 17 |
| » Defeated Phillies (71-81), 4-2 | Shibe Park (6-2) | 75-76 | Won 4 |
| » Starters: Bob Moose vs Chris Short | Sixth | 17½ out |
| Wednesday, September 18 |
| » Lost to Phillies (72-81), 2-1 | Shibe Park (6-3) | 75-77 | |
| » Starters: Bob Veale vs Jerry Johnson | Sixth | 18½ out |
| Friday, September 20 |
| » Defeated Cubs (79-76), 5-0 | Forbes Field (36-39) | 76-77 | |
| » Starters: Fergie Jenkins vs Steve Blass | Sixth | 17 out |
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