| Wednesday, February 14 |
| Future Cub Dan Garibay is born in Maneadoro, Mexico. |
| Tuesday, March 6 |
| Future Cub Terry Adams is born in Mobile, AL. |
| Thursday, April 5 |
| » Major-league debuts: Gene Locklear (Reds) |
| Friday, April 6 |
| » Defeated Expos (0-1), 3-2 | Wrigley Field (1-0) | 1-0 | |
| » Starters: Mike Torrez vs Fergie Jenkins | First | -- |
| » Major-league debuts: Pepe Frias (Expos) |
| Saturday, April 7 |
| » Defeated Expos (0-2), 3-2 | Wrigley Field (2-0) | 2-0 | Won 2 |
| » Starters: Balor Moore vs Milt Pappas | First | -- |
| Sunday, April 8 |
| » Lost to Expos (1-2), 5-2 | Wrigley Field (2-1) | 2-1 | |
| » Starters: Ernie McAnally vs Burt Hooton | Third | 1 out |
| » Major-league debuts: Ray Burris (Cubs) |
| Thursday, April 12 |
| » Lost to Pirates (4-0), 6-0 | Three Rivers Stadium (0-1) | 2-2 | Lost 2 |
| » Starters: Fergie Jenkins vs Bob Moose | Second | 2 out |
| Friday, April 13 |
| » Lost to Cardinals (1-5), 6-3 | Busch Stadium II (0-1) | 2-3 | Lost 3 |
| » Starters: Milt Pappas vs Rick Wise | Third | 2½ out |
| Saturday, April 14 |
| » Defeated Cardinals (1-6), 4-1 | Busch Stadium II (1-1) | 3-3 | |
| » Starters: Rick Reuschel vs Scipio Spinks | Third | 1½ out |
| Sunday, April 15 |
| » Defeated Cardinals (1-7), 8-6 | Busch Stadium II (2-1) | 4-3 | Won 2 |
| » Starters: Burt Hooton vs Reggie Cleveland | Third | 1½ out |
| Tuesday, April 17 |
| » Defeated Mets (5-3), 1-0 | Shea Stadium (1-0) | 5-3 | Won 3 |
| » Starters: Fergie Jenkins vs Tom Seaver | Second | 1½ out |
| Former Cub Vic Aldridge dies in Terre Haute, IN at the age of 80. Former Cub Lefty Weinert dies in Rockledge, FL at the age of 71. |
| Wednesday, April 18 |
| » Defeated Mets (5-4), 1-0 | Shea Stadium (2-0) | 6-3 | Won 4 |
| » Starters: Ray Burris vs Jon Matlack | Second | 1½ out |
| Thursday, April 19 |
| » Lost to Mets (6-4), 3-1 | Shea Stadium (2-1) | 6-4 | |
| » Starters: Rick Reuschel vs Jerry Koosman | Second | 1½ out |
| » Defeated Mets (6-5), 7-0 | Shea Stadium (3-1) | 7-4 | |
| » Starters: Burt Hooton vs Jim McAndrew | Second | 1½ out |
| Saturday, April 21 |
| » Defeated Pirates (7-2), 10-9 | Wrigley Field (3-1) | 8-4 | Won 2 |
| » Starters: Nelson Briles vs Fergie Jenkins | Second | 1½ out |
| Sunday, April 22 |
| » Lost to Pirates (8-2), 10-4 | Wrigley Field (3-2) | 8-5 | |
| » Starters: Dock Ellis vs Milt Pappas | Second | 1½ out |
| » Defeated Pirates (8-3), 11-3 | Wrigley Field (4-2) | 9-5 | |
| » Starters: Steve Blass vs Larry Gura | Second | 1½ out |
| Tuesday, April 24 |
| » Lost to Giants (14-5), 4-2 | Wrigley Field (4-3) | 9-6 | |
| » Starters: Jim Willoughby vs Rick Reuschel | Second | 1½ out |
| Wednesday, April 25 |
| » Lost to Giants (15-5), 5-0 | Wrigley Field (4-4) | 9-7 | Lost 2 |
| » Starters: Juan Marichal vs Fergie Jenkins | Second | 2 out |
| Thursday, April 26 |
| » Lost to Giants (16-5), 7-3 | Wrigley Field (4-5) | 9-8 | Lost 3 |
| » Starters: Ron Bryant vs Burt Hooton | Third | 2½ out |
| Friday, April 27 |
| » Defeated Padres (7-13), 10-2 | Wrigley Field (5-5) | 10-8 | |
| » Starters: Clay Kirby vs Milt Pappas | Second | 3 out |
| Saturday, April 28 |
| » Defeated Padres (7-14), 2-0 | Wrigley Field (6-5) | 11-8 | Won 2 |
| » Starters: Fred Norman vs Rick Reuschel | Second | 3 out |
| Sunday, April 29 |
| » Defeated Padres (7-15), 10-4 | Wrigley Field (7-5) | 12-8 | Won 3 |
| » Starters: Steve Arlin vs Fergie Jenkins | First | -- |
| Tuesday, May 1 |
| » Defeated Dodgers (11-12), 9-5 | Dodger Stadium (1-0) | 13-8 | Won 4 |
| » Starters: Burt Hooton vs Tommy John | First | -- |
| Wednesday, May 2 |
| » Lost to Dodgers (12-12), 4-1 | Dodger Stadium (1-1) | 13-9 | |
| » Starters: Milt Pappas vs Don Sutton | First | -- |
| Future Cub Ramon Tatis is born in Guayubin, D.R. |
| Thursday, May 3 |
| » Defeated Dodgers (12-13), 4-1 | Dodger Stadium (2-1) | 14-9 | |
| » Starters: Rick Reuschel vs Andy Messersmith | First | -- |
| Friday, May 4 |
| » Lost to Giants (20-8), 5-4 | Candlestick Park (0-1) | 14-10 | |
| » Starters: Fergie Jenkins vs Juan Marichal | First | -- |
| Saturday, May 5 |
| » Defeated Giants (20-9), 7-4 | Candlestick Park (1-1) | 15-10 | |
| » Starters: Burt Hooton vs Ron Bryant | First | -- |
| Sunday, May 6 |
| » Lost to Giants (21-9), 11-9 | Candlestick Park (1-2) | 15-11 | |
| » Starters: Milt Pappas vs Jim Barr | First | -- |
| » Lost to Giants (22-9), 4-3 | Candlestick Park (1-3) | 15-12 | Lost 2 |
| » Starters: Larry Gura vs Jim Willoughby | First | -- |
| Monday, May 7 |
| » Lost to Padres (11-18), 4-1 | San Diego/Jack Murphy Stadium (0-1) | 15-13 | Lost 3 |
| » Starters: Rick Reuschel vs Bill Greif | Second | 3 out |
| Tuesday, May 8 |
| » Defeated Padres (11-19), 3-2 | San Diego/Jack Murphy Stadium (1-1) | 16-13 | |
| » Starters: Fergie Jenkins vs Fred Norman | First | -- |
| Wednesday, May 9 |
| » Defeated Padres (11-20), 9-2 | San Diego/Jack Murphy Stadium (2-1) | 17-13 | Won 2 |
| » Starters: Burt Hooton vs Mike Corkins | First | -- |
| Friday, May 11 |
| » Defeated Phillies (11-16), 4-3 | Wrigley Field (8-5) | 18-13 | Won 3 |
| » Starters: Larry Christenson vs Milt Pappas | First | -- |
| Saturday, May 12 |
| » Defeated Phillies (11-17), 3-1 | Wrigley Field (9-5) | 19-13 | Won 4 |
| » Starters: Wayne Twitchell vs Rick Reuschel | First | -- |
| Sunday, May 13 |
| » Defeated Phillies (11-18), 4-2 | Wrigley Field (10-5) | 20-13 | Won 5 |
| » Starters: Steve Carlton vs Fergie Jenkins | First | -- |
| » Defeated Phillies (11-19), 9-3 | Wrigley Field (11-5) | 21-13 | Won 6 |
| » Starters: Dick Ruthven vs Bill Bonham | First | -- |
| Tuesday, May 15 |
| » Defeated Mets (17-15), 4-3 | Wrigley Field (12-5) | 22-13 | Won 7 |
| » Starters: Jerry Koosman vs Burt Hooton | First | -- |
| Wednesday, May 16 |
| » Lost to Cardinals (10-23), 3-1 | Wrigley Field (12-6) | 22-14 | |
| » Starters: Alan Foster vs Rick Reuschel | First | -- |
| Thursday, May 17 |
| » Lost to Cardinals (11-23), 6-4 | Wrigley Field (12-7) | 22-15 | Lost 2 |
| » Starters: Jim Bibby vs Milt Pappas | First | -- |
| Friday, May 18 |
| » Defeated Phillies (13-22), 9-2 | Veteran's Stadium (1-0) | 23-15 | |
| » Starters: Fergie Jenkins vs Dick Ruthven | First | -- |
| Saturday, May 19 |
| » Lost to Phillies (14-22), 3-0 | Veteran's Stadium (1-1) | 23-16 | |
| » Starters: Burt Hooton vs Ken Brett | First | -- |
| » Defeated Phillies (14-23), 7-6 | Veteran's Stadium (2-1) | 24-16 | |
| » Starters: Bill Bonham vs Jim Lonborg | First | -- |
| Tuesday, May 22 |
| » Lost to Expos (16-18), 4-3 | Parc Jarry (0-1) | 24-17 | |
| » Starters: Fergie Jenkins vs Steve Renko | First | -- |
| Wednesday, May 23 |
| » Defeated Expos (16-19), 4-2 | Parc Jarry (1-1) | 25-17 | |
| » Starters: Burt Hooton vs Ernie McAnally | First | -- |
| Friday, May 25 |
| » Defeated Reds (25-17), 7-2 | Riverfront Stadium (1-0) | 26-17 | Won 2 |
| » Starters: Rick Reuschel vs Don Gullett | First | -- |
| Saturday, May 26 |
| » Defeated Reds (25-18), 2-0 | Riverfront Stadium (2-0) | 27-17 | Won 3 |
| » Starters: Milt Pappas vs Ross Grimsley | First | -- |
| Sunday, May 27 |
| » Defeated Reds (25-19), 6-0 | Riverfront Stadium (3-0) | 28-17 | Won 4 |
| » Starters: Fergie Jenkins vs Jim McGlothlin | First | -- |
| Monday, May 28 |
| » Lost to Reds (26-19), 6-5 | Riverfront Stadium (3-1) | 28-18 | |
| » Starters: Burt Hooton vs Jack Billingham | First | -- |
| Tuesday, May 29 |
| » Defeated Astros (28-21), 7-1 | Wrigley Field (13-7) | 29-18 | |
| » Starters: Jerry Reuss vs Rick Reuschel | First | -- |
| Wednesday, May 30 |
| » Lost to Astros (29-21), 4-1 | Wrigley Field (13-8) | 29-19 | |
| » Starters: Ken Forsch vs Milt Pappas | First | -- |
| Thursday, May 31 |
| » Defeated Astros (29-22), 16-8 | Wrigley Field (14-8) | 30-19 | |
| » Starters: Dave Roberts vs Fergie Jenkins | First | -- |
| Friday, June 1 |
| » Lost to Braves (18-30), 8-7 | Wrigley Field (14-9) | 30-20 | |
| » Starters: Roric Harrison vs Burt Hooton | First | -- |
| Saturday, June 2 |
| » Defeated Braves (18-31), 4-3 | Wrigley Field (15-9) | 31-20 | |
| » Starters: Carl Morton vs Rick Reuschel | First | -- |
| Sunday, June 3 |
| » Defeated Braves (18-32), 3-0 | Wrigley Field (16-9) | 32-20 | Won 2 |
| » Starters: Ron Reed vs Milt Pappas | First | -- |
| Future Cub Robert Machado is born in Caracas, Venezuela. |
| Tuesday, June 5 |
| » Lost to Dodgers (32-21), 10-1 | Wrigley Field (16-10) | 32-21 | |
| » Starters: Claude Osteen vs Fergie Jenkins | First | -- |
| Wednesday, June 6 |
| » Defeated Dodgers (32-22), 6-4 | Wrigley Field (17-10) | 33-21 | |
| » Starters: Don Sutton vs Burt Hooton | First | -- |
| Thursday, June 7 |
| » Lost to Dodgers (33-22), 4-0 | Wrigley Field (17-11) | 33-22 | |
| » Starters: Andy Messersmith vs Rick Reuschel | First | -- |
| Friday, June 8 |
| » Defeated Reds (30-24), 6-5 | Wrigley Field (18-11) | 34-22 | |
| » Starters: Clay Carroll vs Milt Pappas | First | -- |
| Saturday, June 9 |
| » Lost to Reds (31-24), 8-4 | Wrigley Field (18-12) | 34-23 | |
| » Starters: Jack Billingham vs Fergie Jenkins | First | -- |
| » Major-league debuts: Dan Driessen (Reds) |
| Sunday, June 10 |
| » Defeated Reds (31-25), 9-7 | Wrigley Field (19-12) | 35-23 | |
| » Starters: Jim McGlothlin vs Burt Hooton | First | -- |
| Monday, June 11 |
| » Major-league debuts: Tom Dettore (Pirates) |
| Tuesday, June 12 |
| » Defeated Astros (33-28), 3-0 | Astrodome (1-0) | 36-23 | Won 2 |
| » Starters: Rick Reuschel vs Ken Forsch | First | -- |
| Wednesday, June 13 |
| » Lost to Astros (34-28), 6-1 | Astrodome (1-1) | 36-24 | |
| » Starters: Milt Pappas vs Don Wilson | First | -- |
| Thursday, June 14 |
| » Defeated Astros (34-29), 5-4 | Astrodome (2-1) | 37-24 | |
| » Starters: Fergie Jenkins vs Jerry Reuss | First | -- |
| Friday, June 15 |
| » Lost to Braves (27-34), 8-3 | Atlanta-Fulton County Stadium (0-1) | 37-25 | |
| » Starters: Bill Bonham vs Roric Harrison | First | -- |
| Saturday, June 16 |
| » Defeated Braves (27-35), 4-3 | Atlanta-Fulton County Stadium (1-1) | 38-25 | |
| » Starters: Rick Reuschel vs Phil Niekro | First | -- |
| Sunday, June 17 |
| » Defeated Braves (27-36), 9-3 | Atlanta-Fulton County Stadium (2-1) | 39-25 | Won 2 |
| » Starters: Burt Hooton vs Carl Morton | First | -- |
| » Lost to Braves (28-36), 8-5 | Atlanta-Fulton County Stadium (2-2) | 39-26 | |
| » Starters: Milt Pappas vs Jimmy Freeman | First | -- |
| Monday, June 18 |
| » Lost to Pirates (26-33), 3-1 | Three Rivers Stadium (0-2) | 39-27 | Lost 2 |
| » Starters: Fergie Jenkins vs Dock Ellis | First | -- |
| Tuesday, June 19 |
| » Defeated Pirates (26-34), 6-3 | Three Rivers Stadium (1-2) | 40-27 | |
| » Starters: Larry Gura vs Bob Johnson | First | -- |
| » Lost to Pirates (27-34), 4-3 | Three Rivers Stadium (1-3) | 40-28 | |
| » Starters: Bill Bonham vs Bob Moose | First | -- |
| Wednesday, June 20 |
| » Defeated Pirates (27-35), 5-3 | Three Rivers Stadium (2-3) | 41-28 | |
| » Starters: Rick Reuschel vs Nelson Briles | First | -- |
| Friday, June 22 |
| » Lost to Cardinals (32-33), 3-0 | Busch Stadium II (2-2) | 41-29 | |
| » Starters: Burt Hooton vs Reggie Cleveland | First | -- |
| Saturday, June 23 |
| » Lost to Cardinals (33-33), 3-2 | Busch Stadium II (2-3) | 41-30 | Lost 2 |
| » Starters: Fergie Jenkins vs Rick Wise | First | -- |
| Former Cub Cliff Aberson dies in Vallejo, CA at the age of 52. |
| Sunday, June 24 |
| » Defeated Cardinals (33-34), 2-0 | Busch Stadium II (3-3) | 42-30 | |
| » Starters: Milt Pappas vs Tom Murphy | First | -- |
| Monday, June 25 |
| » Defeated Mets (30-35), 3-2 | Shea Stadium (4-1) | 43-30 | Won 2 |
| » Starters: Rick Reuschel vs Jon Matlack | First | -- |
| Tuesday, June 26 |
| » Defeated Mets (30-36), 5-1 | Shea Stadium (5-1) | 44-30 | Won 3 |
| » Starters: Burt Hooton vs Jerry Koosman | First | -- |
| Wednesday, June 27 |
| » Defeated Expos (33-34), 6-1 | Wrigley Field (20-12) | 45-30 | Won 4 |
| » Starters: Balor Moore vs Fergie Jenkins | First | -- |
| » Lost to Expos (34-34), 5-4 | Wrigley Field (20-13) | 45-31 | |
| » Starters: Mike Torrez vs Larry Gura | First | -- |
| Thursday, June 28 |
| » Defeated Expos (34-35), 4-2 | Wrigley Field (21-13) | 46-31 | |
| » Starters: Steve Renko vs Milt Pappas | First | -- |
| Friday, June 29 |
| » Defeated Mets (31-39), 4-3 | Wrigley Field (22-13) | 47-31 | Won 2 |
| » Starters: Tom Seaver vs Rick Reuschel | First | -- |
| Future Cub Pedro Valdes is born in Fajardo, P.R. |
| Saturday, June 30 |
| » Lost to Mets (32-39), 2-1 | Wrigley Field (22-14) | 47-32 | |
| » Starters: Jon Matlack vs Burt Hooton | First | -- |
| Sunday, July 1 |
| » Lost to Mets (33-39), 6-5 | Wrigley Field (22-15) | 47-33 | Lost 2 |
| » Starters: Jerry Koosman vs Fergie Jenkins | First | -- |
| » Defeated Mets (33-40), 6-5 | Wrigley Field (23-15) | 48-33 | |
| » Starters: Harry Parker vs Larry Gura | First | -- |
| Tuesday, July 3 |
| » Lost to Phillies (37-41), 8-2 | Wrigley Field (23-16) | 48-34 | |
| » Starters: Jim Lonborg vs Milt Pappas | First | -- |
| Wednesday, July 4 |
| » Defeated Phillies (37-42), 3-2 | Wrigley Field (24-16) | 49-34 | |
| » Starters: Wayne Twitchell vs Burt Hooton | First | -- |
| Thursday, July 5 |
| » Lost to Phillies (38-42), 7-4 | Wrigley Field (24-17) | 49-35 | |
| » Starters: Steve Carlton vs Rick Reuschel | First | -- |
| Friday, July 6 |
| » Defeated Padres (29-54), 8-5 | San Diego/Jack Murphy Stadium (3-1) | 50-35 | |
| » Starters: Fergie Jenkins vs Clay Kirby | First | -- |
| Saturday, July 7 |
| » Lost to Padres (30-54), 4-3 | San Diego/Jack Murphy Stadium (3-2) | 50-36 | |
| » Starters: Milt Pappas vs Bill Greif | First | -- |
| Sunday, July 8 |
| » Lost to Padres (31-54), 4-2 | San Diego/Jack Murphy Stadium (3-3) | 50-37 | Lost 2 |
| » Starters: Burt Hooton vs Randy Jones | First | -- |
| Tuesday, July 10 |
| » Defeated Giants (49-40), 4-2 | Candlestick Park (2-3) | 51-37 | |
| » Starters: Rick Reuschel vs Ron Bryant | First | -- |
| Wednesday, July 11 |
| » Lost to Giants (50-40), 7-3 | Candlestick Park (2-4) | 51-38 | |
| » Starters: Milt Pappas vs Jim Barr | First | -- |
| Friday, July 13 |
| » Lost to Dodgers (57-34), 5-0 | Dodger Stadium (2-2) | 51-39 | Lost 2 |
| » Starters: Fergie Jenkins vs Tommy John | First | -- |
| Saturday, July 14 |
| » Lost to Dodgers (58-34), 7-3 | Dodger Stadium (2-3) | 51-40 | Lost 3 |
| » Starters: Burt Hooton vs Al Downing | First | -- |
| Sunday, July 15 |
| » Lost to Dodgers (59-34), 9-3 | Dodger Stadium (2-4) | 51-41 | Lost 4 |
| » Starters: Rick Reuschel vs Claude Osteen | First | -- |
| Tuesday, July 17 |
| » Lost to Padres (32-60), 1-0 | Wrigley Field (24-18) | 51-42 | Lost 5 |
| » Starters: Steve Arlin vs Milt Pappas | First | -- |
| Wednesday, July 18 |
| » Lost to Padres (33-60), 8-5 | Wrigley Field (24-19) | 51-43 | Lost 6 |
| » Starters: Clay Kirby vs Fergie Jenkins | First | -- |
| Thursday, July 19 |
| » Defeated Padres (33-61), 12-5 | Wrigley Field (25-19) | 52-43 | |
| » Starters: Bill Greif vs Burt Hooton | First | -- |
| Friday, July 20 |
| » Lost to Giants (54-43), 5-4 | Wrigley Field (25-20) | 52-44 | |
| » Starters: Juan Marichal vs Rick Reuschel | First | -- |
| Saturday, July 21 |
| » Lost to Giants (55-43), 3-1 | Wrigley Field (25-21) | 52-45 | Lost 2 |
| » Starters: Jim Barr vs Larry Gura | First | -- |
| Sunday, July 22 |
| » Lost to Giants (56-43), 4-1 | Wrigley Field (25-22) | 52-46 | Lost 3 |
| » Starters: Tom Bradley vs Fergie Jenkins | First | -- |
| Thursday, July 26 |
| » Lost to Pirates (47-49), 3-2 | Wrigley Field (25-23) | 52-47 | Lost 4 |
| » Starters: Dock Ellis vs Rick Reuschel | Second | 1½ out |
| Friday, July 27 |
| » Lost to Pirates (48-49), 10-6 | Wrigley Field (25-24) | 52-48 | Lost 5 |
| » Starters: Nelson Briles vs Larry Gura | Second | 1½ out |
| Saturday, July 28 |
| » Lost to Cardinals (54-46), 7-2 | Wrigley Field (25-25) | 52-49 | Lost 6 |
| » Starters: Reggie Cleveland vs Fergie Jenkins | Second | 2½ out |
| » Major-league debuts: Andre Thornton (Cubs) |
| Sunday, July 29 |
| » Lost to Cardinals (55-46), 5-3 | Wrigley Field (25-26) | 52-50 | Lost 7 |
| » Starters: Tom Murphy vs Milt Pappas | Second | 2½ out |
| » Defeated Cardinals (55-47), 5-4 | Wrigley Field (26-26) | 53-50 | |
| » Starters: Rich Folkers vs Bill Bonham | Second | 2½ out |
| Monday, July 30 |
| » Defeated Cardinals (55-48), 3-1 | Wrigley Field (27-26) | 54-50 | Won 2 |
| » Starters: Bob Gibson vs Rick Reuschel | Second | 1½ out |
| Tuesday, July 31 |
| » Defeated Phillies (48-57), 4-3 | Veteran's Stadium (3-1) | 55-50 | Won 3 |
| » Starters: Fergie Jenkins vs Jim Lonborg | Second | 2 out |
| » Lost to Phillies (49-57), 6-5 | Veteran's Stadium (3-2) | 55-51 | |
| » Starters: Milt Pappas vs Ken Brett | Second | 2 out |
| Wednesday, August 1 |
| » Lost to Phillies (50-57), 2-0 | Veteran's Stadium (3-3) | 55-52 | Lost 2 |
| » Starters: Burt Hooton vs Wayne Twitchell | Second | 3½ out |
| Thursday, August 2 |
| » Lost to Phillies (51-57), 4-1 | Veteran's Stadium (3-4) | 55-53 | Lost 3 |
| » Starters: Bill Bonham vs Dick Ruthven | Second | 3½ out |
| Friday, August 3 |
| » Defeated Expos (51-56), 3-0 | Parc Jarry (2-1) | 56-53 | |
| » Starters: Rick Reuschel vs Steve Renko | Second | 2½ out |
| Saturday, August 4 |
| » Lost to Expos (52-56), 6-1 | Parc Jarry (2-2) | 56-54 | |
| » Starters: Fergie Jenkins vs Steve Rogers | Second | 3½ out |
| Sunday, August 5 |
| » Lost to Expos (53-56), 3-2 | Parc Jarry (2-3) | 56-55 | Lost 2 |
| » Starters: Burt Hooton vs Mike Torrez | Second | 5 out |
| Monday, August 6 |
| » Lost to Expos (54-56), 7-3 | Parc Jarry (2-4) | 56-56 | Lost 3 |
| » Starters: Bill Bonham vs Balor Moore | Second | 5 out |
| Tuesday, August 7 |
| » Lost to Reds (68-47), 1-0 | Riverfront Stadium (3-2) | 56-57 | Lost 4 |
| » Starters: Rick Reuschel vs Don Gullett | Second | 5 out |
| Former Cub Wilbur Cooper dies in Encino, CA at the age of 82. |
| Wednesday, August 8 |
| » Lost to Reds (69-47), 4-3 | Riverfront Stadium (3-3) | 56-58 | Lost 5 |
| » Starters: Fergie Jenkins vs Fred Norman | Fourth | 5 out |
| Friday, August 10 |
| » Lost to Astros (60-58), 6-4 | Wrigley Field (27-27) | 56-59 | Lost 6 |
| » Starters: J.R. Richard vs Burt Hooton | Fourth | 4½ out |
| Saturday, August 11 |
| » Lost to Astros (61-58), 6-4 | Wrigley Field (27-28) | 56-60 | Lost 7 |
| » Starters: Jerry Reuss vs Rick Reuschel | Fourth | 4½ out |
| Sunday, August 12 |
| » Lost to Astros (62-58), 3-2 | Wrigley Field (27-29) | 56-61 | Lost 8 |
| » Starters: Don Wilson vs Bill Bonham | Fourth | 4½ out |
| Tuesday, August 14 |
| » Lost to Braves (57-65), 6-2 | Wrigley Field (27-30) | 56-62 | Lost 9 |
| » Starters: Carl Morton vs Fergie Jenkins | Fourth | 5 out |
| Wednesday, August 15 |
| » Lost to Braves (58-65), 15-1 | Wrigley Field (27-31) | 56-63 | Lost 10 |
| » Starters: Phil Niekro vs Rick Reuschel | Fourth | 5 out |
| Thursday, August 16 |
| » Lost to Braves (59-65), 10-2 | Wrigley Field (27-32) | 56-64 | Lost 11 |
| » Starters: Roric Harrison vs Milt Pappas | Fourth | 5½ out |
| Friday, August 17 |
| » Defeated Dodgers (76-46), 5-1 | Wrigley Field (28-32) | 57-64 | |
| » Starters: Andy Messersmith vs Bill Bonham | Fourth | 4½ out |
| Saturday, August 18 |
| » Defeated Dodgers (76-47), 2-1 | Wrigley Field (29-32) | 58-64 | Won 2 |
| » Starters: Claude Osteen vs Burt Hooton | Fourth | 3½ out |
| Sunday, August 19 |
| » Lost to Dodgers (77-47), 2-1 | Wrigley Field (29-33) | 58-65 | |
| » Starters: Tommy John vs Rick Reuschel | Fourth | 4½ out |
| Tuesday, August 21 |
| » Defeated Reds (76-51), 6-4 | Wrigley Field (30-33) | 59-65 | |
| » Starters: Don Gullett vs Fergie Jenkins | Third | 3½ out |
| Future Cub Ismael Valdes is born in Victoria, Mexico. |
| Wednesday, August 22 |
| » Defeated Reds (76-52), 6-5 | Wrigley Field (31-33) | 60-65 | Won 2 |
| » Starters: Fred Norman vs Milt Pappas | Third | 3½ out |
| Thursday, August 23 |
| » Defeated Reds (76-53), 4-3 | Wrigley Field (32-33) | 61-65 | Won 3 |
| » Starters: Ross Grimsley vs Bill Bonham | Third | 3 out |
| » Major-league debuts: Matt Alexander (Cubs) |
| Friday, August 24 |
| » Lost to Astros (67-63), 4-2 | Astrodome (2-2) | 61-66 | |
| » Starters: Burt Hooton vs Jerry Reuss | Third | 4 out |
| Saturday, August 25 |
| » Defeated Astros (67-64), 4-3 | Astrodome (3-2) | 62-66 | |
| » Starters: Rick Reuschel vs Dave Roberts | Third | 3 out |
| Sunday, August 26 |
| » Defeated Astros (67-65), 4-2 | Astrodome (4-2) | 63-66 | Won 2 |
| » Starters: Fergie Jenkins vs Don Wilson | Third | 2 out |
| Tuesday, August 28 |
| » Defeated Braves (63-70), 9-6 | Atlanta-Fulton County Stadium (3-2) | 64-66 | Won 3 |
| » Starters: Milt Pappas vs Ron Schueler | Third | 2½ out |
| Wednesday, August 29 |
| » Lost to Braves (64-70), 7-4 | Atlanta-Fulton County Stadium (3-3) | 64-67 | |
| » Starters: Bill Bonham vs Carl Morton | Third | 2½ out |
| Friday, August 31 |
| » Lost to Pirates (64-65), 7-0 | Three Rivers Stadium (2-4) | 64-68 | Lost 2 |
| » Starters: Rick Reuschel vs Jim Rooker | Third | 3½ out |
| » Lost to Pirates (65-65), 5-2 | Three Rivers Stadium (2-5) | 64-69 | Lost 3 |
| » Starters: Fergie Jenkins vs John Morlan | Third | 3½ out |
| » Major-league debuts: Tom Lundstedt (Cubs) |
| Saturday, September 1 |
| » Lost to Pirates (66-65), 1-0 | Three Rivers Stadium (2-6) | 64-70 | Lost 4 |
| » Starters: Burt Hooton vs Bruce Kison | Third | 3½ out |
| Sunday, September 2 |
| » Defeated Pirates (66-66), 5-3 | Three Rivers Stadium (3-6) | 65-70 | |
| » Starters: Bill Bonham vs Bob Moose | Third | 3½ out |
| Monday, September 3 |
| » Lost to Expos (66-70), 5-2 | Parc Jarry (2-5) | 65-71 | |
| » Starters: Milt Pappas vs Steve Renko | Fourth | 4 out |
| Tuesday, September 4 |
| » Lost to Expos (67-70), 3-2 | Parc Jarry (2-6) | 65-72 | Lost 2 |
| » Starters: Fergie Jenkins vs Steve Rogers | Fourth | 5 out |
| Wednesday, September 5 |
| » Major-league debuts: Mike Easler and Greg Gross (Astros) |
| Thursday, September 6 |
| » Lost to Expos (68-70), 5-3 | Parc Jarry (2-7) | 65-73 | Lost 3 |
| » Starters: Rick Reuschel vs Balor Moore | Fifth | 6 out |
| Friday, September 7 |
| » Defeated Cardinals (72-69), 8-2 | Wrigley Field (33-33) | 66-73 | |
| » Starters: Rick Wise vs Burt Hooton | Fifth | 5 out |
| Saturday, September 8 |
| » Defeated Cardinals (72-70), 3-1 | Wrigley Field (34-33) | 67-73 | Won 2 |
| » Starters: Reggie Cleveland vs Milt Pappas | Fourth | 4 out |
| Sunday, September 9 |
| » Defeated Cardinals (72-71), 5-4 | Wrigley Field (35-33) | 68-73 | Won 3 |
| » Starters: Mike Nagy vs Fergie Jenkins | Fifth | 3 out |
| Monday, September 10 |
| » Lost to Pirates (70-70), 11-3 | Wrigley Field (35-34) | 68-74 | |
| » Starters: Jim Rooker vs Rick Reuschel | Fifth | 3½ out |
| » Major-league debuts: Phil Garner (Pirates) |
| Tuesday, September 11 |
| » Defeated Pirates (70-71), 2-0 | Wrigley Field (36-34) | 69-74 | |
| » Starters: Steve Blass vs Burt Hooton | Fourth | 2½ out |
| Wednesday, September 12 |
| » Lost to Pirates (71-71), 4-2 | Wrigley Field (36-35) | 69-75 | |
| » Starters: Bruce Kison vs Mike Paul | Fifth | 3 out |
| Thursday, September 13 |
| » Lost to Pirates (72-71), 6-1 | Wrigley Field (36-36) | 69-76 | Lost 2 |
| » Starters: Bob Moose vs Milt Pappas | Fifth | 4 out |
| Saturday, September 15 |
| » Lost to Mets (72-75), 5-1 | Shea Stadium (5-2) | 69-77 | Lost 3 |
| » Starters: Fergie Jenkins vs George Stone | Fifth | 5 out |
| » Defeated Mets (72-76), 7-0 | Shea Stadium (6-2) | 70-77 | |
| » Starters: Rick Reuschel vs Ray Sadecki | Fifth | 5 out |
| Sunday, September 16 |
| » Lost to Mets (73-76), 4-3 | Shea Stadium (6-3) | 70-78 | |
| » Starters: Burt Hooton vs Jerry Koosman | Fifth | 5 out |
| Tuesday, September 18 |
| » Lost to Phillies (66-84), 5-2 | Wrigley Field (36-37) | 70-79 | Lost 2 |
| » Starters: Wayne Twitchell vs Milt Pappas | Fifth | 5 out |
| » Defeated Phillies (66-85), 3-2 | Wrigley Field (37-37) | 71-79 | |
| » Starters: Ken Brett vs Bill Bonham | Fifth | 5 out |
| Wednesday, September 19 |
| » Defeated Expos (75-76), 8-6 | Wrigley Field (38-37) | 72-79 | Won 2 |
| » Starters: Mike Torrez vs Rick Reuschel | Fourth | 4 out |
| Thursday, September 20 |
| » Defeated Expos (75-77), 5-4 | Wrigley Field (39-37) | 73-79 | Won 3 |
| » Starters: Steve Renko vs Fergie Jenkins | Fifth | 3 out |
| Friday, September 21 |
| » Defeated Expos (75-78), 3-1 | Wrigley Field (40-37) | 74-79 | Won 4 |
| » Starters: Steve Rogers vs Burt Hooton | Fifth | 2½ out |
| Saturday, September 22 |
| » Defeated Phillies (68-87), 5-2 | Veteran's Stadium (4-4) | 75-79 | Won 5 |
| » Starters: Bill Bonham vs Barry Lersch | Fifth | 2½ out |
| Sunday, September 23 |
| » Lost to Phillies (69-87), 9-7 | Veteran's Stadium (4-5) | 75-80 | |
| » Starters: Rick Reuschel vs Ken Brett | Fourth | 3½ out |
| Tuesday, September 25 |
| » Defeated Cardinals (76-81), 4-3 | Busch Stadium II (4-3) | 76-80 | |
| » Starters: Fergie Jenkins vs Alan Foster | Third | 3½ out |
| Wednesday, September 26 |
| » Lost to Cardinals (77-81)</ |
