| Wednesday, February 23 |
| Future Cub Rondell White is born in Milledgeville, GA. |
| Sunday, March 26 |
| Future Cub Jason Maxwell is born in Lewisburg, TN. |
| Sunday, April 9 |
| Former Cub Roy Leslie dies in Sherman, TX at the age of 78. |
| Tuesday, April 11 |
| Future Cub Robin Jennings is born in Singapore, Singapore. |
| Saturday, April 15 |
| » Lost to Phillies (1-0), 4-2 | Wrigley Field (0-1) | 0-1 | |
| » Starters: Steve Carlton vs Fergie Jenkins | Second | 1 out |
| Sunday, April 16 |
| » Defeated Phillies (1-1), 4-0 | Wrigley Field (1-1) | 1-1 | |
| » Starters: Dick Selma vs Burt Hooton | Second | 1 out |
| Tuesday, April 18 |
| » Defeated Pirates (1-2), 6-4 | Three Rivers Stadium (1-0) | 2-1 | Won 2 |
| » Starters: Milt Pappas vs Bob Moose | Second | 1 out |
| Wednesday, April 19 |
| » Lost to Pirates (2-2), 5-2 | Three Rivers Stadium (1-1) | 2-2 | |
| » Starters: Juan Pizarro vs Bob Johnson | Third | 1½ out |
| Thursday, April 20 |
| » Lost to Pirates (3-2), 7-5 | Three Rivers Stadium (1-2) | 2-3 | Lost 2 |
| » Starters: Fergie Jenkins vs Dock Ellis | Third | 2 out |
| Friday, April 21 |
| » Lost to Mets (2-2), 2-0 | Shea Stadium (0-1) | 2-4 | Lost 3 |
| » Starters: Burt Hooton vs Tom Seaver | Fifth | 3 out |
| Sunday, April 23 |
| » Lost to Mets (3-2), 8-2 | Shea Stadium (0-2) | 2-5 | Lost 4 |
| » Starters: Milt Pappas vs Gary Gentry | Fourth | 4 out |
| » Lost to Mets (4-2), 7-6 | Shea Stadium (0-3) | 2-6 | Lost 5 |
| » Starters: Bill Hands vs Jerry Koosman | Fourth | 4 out |
| Monday, April 24 |
| » Lost to Astros (7-2), 3-2 | Astrodome (0-1) | 2-7 | Lost 6 |
| » Starters: Fergie Jenkins vs Ken Forsch | Fifth | 4½ out |
| Tuesday, April 25 |
| » Lost to Astros (8-2), 5-4 | Astrodome (0-2) | 2-8 | Lost 7 |
| » Starters: Burt Hooton vs Jerry Reuss | Fourth | 4½ out |
| Wednesday, April 26 |
| » Lost to Astros (9-2), 5-4 | Astrodome (0-3) | 2-9 | Lost 8 |
| » Starters: Juan Pizarro vs Dave Roberts | Fifth | 5½ out |
| » Major-league debuts: Bobby Fenwick (Astros) |
| Friday, April 28 |
| » Defeated Reds (4-7), 10-8 | Wrigley Field (2-1) | 3-9 | |
| » Starters: Jack Billingham vs Fergie Jenkins | Sixth | 6 out |
| Saturday, April 29 |
| » Lost to Reds (5-7), 3-2 | Wrigley Field (2-2) | 3-10 | |
| » Starters: Jim McGlothlin vs Milt Pappas | Fourth | 6 out |
| Sunday, April 30 |
| » Defeated Reds (5-8), 6-4 | Wrigley Field (3-2) | 4-10 | |
| » Starters: Gary Nolan vs Burt Hooton | Fifth | 5½ out |
| Tuesday, May 2 |
| » Defeated Braves (7-9), 12-1 | Wrigley Field (4-2) | 5-10 | Won 2 |
| » Starters: Ron Reed vs Bill Hands | Fifth | 5½ out |
| Wednesday, May 3 |
| » Defeated Braves (7-10), 12-1 | Wrigley Field (5-2) | 6-10 | Won 3 |
| » Starters: Pat Jarvis vs Fergie Jenkins | Fifth | 5½ out |
| Thursday, May 4 |
| » Defeated Braves (7-11), 8-0 | Wrigley Field (6-2) | 7-10 | Won 4 |
| » Starters: Tom Kelley vs Milt Pappas | Fourth | 5 out |
| Future Cub Manny Aybar is born in Bani, D.R. |
| Friday, May 5 |
| » Lost to Astros (12-5), 3-0 | Wrigley Field (6-3) | 7-11 | |
| » Starters: Larry Dierker vs Burt Hooton | Fourth | 5 out |
| Saturday, May 6 |
| » Defeated Astros (12-6), 6-4 | Wrigley Field (7-3) | 8-11 | |
| » Starters: Ken Forsch vs Bill Hands | Fourth | 4 out |
| Tuesday, May 9 |
| » Defeated Reds (8-12), 7-1 | Riverfront Stadium (1-0) | 9-11 | Won 2 |
| » Starters: Fergie Jenkins vs Jim McGlothlin | Fifth | 4 out |
| Wednesday, May 10 |
| » Defeated Reds (8-13), 4-2 | Riverfront Stadium (2-0) | 10-11 | Won 3 |
| » Starters: Milt Pappas vs Gary Nolan | Fourth | 4 out |
| Friday, May 12 |
| » Defeated Braves (9-15), 2-0 | Atlanta-Fulton County Stadium (1-0) | 11-11 | Won 4 |
| » Starters: Bill Hands vs Ron Reed | Fourth | 4 out |
| Sunday, May 14 |
| » Lost to Braves (10-15), 2-1 | Atlanta-Fulton County Stadium (1-1) | 11-12 | |
| » Starters: Milt Pappas vs Phil Niekro | Fourth | 5½ out |
| Monday, May 15 |
| » Lost to Phillies (15-10), 4-0 | Veteran's Stadium (0-1) | 11-13 | Lost 2 |
| » Starters: Fergie Jenkins vs Woodie Fryman | Fifth | 6½ out |
| Tuesday, May 16 |
| » Defeated Phillies (15-11), 8-1 | Veteran's Stadium (1-1) | 12-13 | |
| » Starters: Burt Hooton vs Bill Champion | Fifth | 6½ out |
| Wednesday, May 17 |
| » Defeated Phillies (15-12), 3-2 | Veteran's Stadium (2-1) | 13-13 | Won 2 |
| » Starters: Bill Hands vs Steve Carlton | Fourth | 6½ out |
| Thursday, May 18 |
| » Defeated Cardinals (10-20), 6-4 | Busch Stadium II (1-0) | 14-13 | Won 3 |
| » Starters: Milt Pappas vs Al Santorini | Fourth | 6½ out |
| Friday, May 19 |
| » Lost to Cardinals (11-20), 4-3 | Busch Stadium II (1-1) | 14-14 | |
| » Starters: Fergie Jenkins vs Scipio Spinks | Fourth | 7½ out |
| Saturday, May 20 |
| » Lost to Cardinals (12-20), 3-2 | Busch Stadium II (1-2) | 14-15 | Lost 2 |
| » Starters: Burt Hooton vs Bob Gibson | Fourth | 9 out |
| Sunday, May 21 |
| » Defeated Cardinals (12-21), 3-2 | Busch Stadium II (2-2) | 15-15 | |
| » Starters: Bill Hands vs Rick Wise | Third | 9 out |
| Tuesday, May 23 |
| » Defeated Mets (25-8), 2-1 | Wrigley Field (8-3) | 16-15 | Won 2 |
| » Starters: Gary Gentry vs Fergie Jenkins | Third | 8 out |
| Wednesday, May 24 |
| » Defeated Mets (25-9), 5-1 | Wrigley Field (9-3) | 17-15 | Won 3 |
| » Starters: Buzz Capra vs Burt Hooton | Third | 7 out |
| Thursday, May 25 |
| » Lost to Mets (26-9), 3-2 | Wrigley Field (9-4) | 17-16 | |
| » Starters: Jon Matlack vs Bill Hands | Third | 8 out |
| Friday, May 26 |
| » Defeated Expos (16-20), 5-3 | Wrigley Field (10-4) | 18-16 | |
| » Starters: Ernie McAnally vs Juan Pizarro | Third | 7 out |
| Saturday, May 27 |
| » Defeated Expos (16-21), 5-3 | Wrigley Field (11-4) | 19-16 | Won 2 |
| » Starters: Mike Torrez vs Fergie Jenkins | Third | 7 out |
| Sunday, May 28 |
| » Lost to Expos (17-21), 7-5 | Wrigley Field (11-5) | 19-17 | |
| » Starters: Bill Stoneman vs Burt Hooton | Third | 7 out |
| Monday, May 29 |
| » Defeated Expos (17-22), 5-2 | Wrigley Field (12-5) | 20-17 | |
| » Starters: Carl Morton vs Milt Pappas | Third | 7 out |
| Wednesday, May 31 |
| » Lost to Cardinals (16-25), 1-0 | Wrigley Field (12-6) | 20-18 | |
| » Starters: Bob Gibson vs Fergie Jenkins | Third | 8 out |
| Thursday, June 1 |
| » Defeated Cardinals (16-26), 7-3 | Wrigley Field (13-6) | 21-18 | |
| » Starters: Rick Wise vs Bill Hands | Third | 8 out |
| Friday, June 2 |
| » Defeated Padres (16-27), 2-1 | San Diego/Jack Murphy Stadium (1-0) | 22-18 | Won 2 |
| » Starters: Burt Hooton vs Clay Kirby | Third | 7 out |
| Saturday, June 3 |
| » Defeated Padres (16-28), 8-3 | San Diego/Jack Murphy Stadium (2-0) | 23-18 | Won 3 |
| » Starters: Milt Pappas vs Steve Arlin | Third | 7 out |
| Sunday, June 4 |
| » Defeated Padres (16-29), 3-1 | San Diego/Jack Murphy Stadium (3-0) | 24-18 | Won 4 |
| » Starters: Fergie Jenkins vs Bill Greif | Third | 6 out |
| Tuesday, June 6 |
| » Lost to Dodgers (29-18), 5-0 | Dodger Stadium (0-1) | 24-19 | |
| » Starters: Bill Hands vs Al Downing | Third | 7 out |
| Future Cub Brooks Kieschnick is born in Robstown, TX. |
| Wednesday, June 7 |
| » Defeated Dodgers (29-19), 5-1 | Dodger Stadium (1-1) | 25-19 | |
| » Starters: Burt Hooton vs Bill Singer | Third | 6 out |
| Thursday, June 8 |
| » Lost to Dodgers (30-19), 2-1 | Dodger Stadium (1-2) | 25-20 | |
| » Starters: Juan Pizarro vs Tommy John | Third | 6 out |
| Saturday, June 10 |
| » Defeated Giants (17-38), 4-2 | Candlestick Park (1-0) | 26-20 | |
| » Starters: Fergie Jenkins vs Steve Stone | Third | 5½ out |
| Sunday, June 11 |
| » Defeated Giants (17-39), 4-0 | Candlestick Park (2-0) | 27-20 | Won 2 |
| » Starters: Bill Hands vs Juan Marichal | Third | 5 out |
| » Lost to Giants (18-39), 3-1 | Candlestick Park (2-1) | 27-21 | |
| » Starters: Burt Hooton vs Ron Bryant | Third | 5 out |
| » Major-league debuts: Randy Moffitt (Giants) |
| Tuesday, June 13 |
| » Lost to Padres (18-34), 4-3 | Wrigley Field (13-7) | 27-22 | Lost 2 |
| » Starters: Clay Kirby vs Milt Pappas | Third | 5 out |
| Wednesday, June 14 |
| » Defeated Padres (18-35), 12-9 | Wrigley Field (14-7) | 28-22 | |
| » Starters: Steve Arlin vs Fergie Jenkins | Third | 4½ out |
| Thursday, June 15 |
| » Defeated Padres (18-36), 10-1 | Wrigley Field (15-7) | 29-22 | Won 2 |
| » Starters: Bill Greif vs Bill Hands | Third | 4½ out |
| Friday, June 16 |
| » Defeated Dodgers (32-23), 4-0 | Wrigley Field (16-7) | 30-22 | Won 3 |
| » Starters: Claude Osteen vs Burt Hooton | Third | 4½ out |
| Saturday, June 17 |
| » Defeated Dodgers (32-24), 7-2 | Wrigley Field (17-7) | 31-22 | Won 4 |
| » Starters: Al Downing vs Milt Pappas | Third | 3½ out |
| Sunday, June 18 |
| » Defeated Dodgers (32-25), 5-4 | Wrigley Field (18-7) | 32-22 | Won 5 |
| » Starters: Bill Singer vs Fergie Jenkins | Third | 3 out |
| Monday, June 19 |
| » Defeated Giants (21-43), 7-6 | Wrigley Field (19-7) | 33-22 | Won 6 |
| » Starters: Steve Stone vs Bill Hands | Third | 2½ out |
| » Major-league debuts: Rick Reuschel (Cubs) |
| Tuesday, June 20 |
| » Defeated Giants (21-44), 15-8 | Wrigley Field (20-7) | 34-22 | Won 7 |
| » Starters: Don Carrithers vs Burt Hooton | Third | 2 out |
| Wednesday, June 21 |
| » Lost to Giants (22-44), 4-0 | Wrigley Field (20-8) | 34-23 | |
| » Starters: Ron Bryant vs Milt Pappas | Third | 2 out |
| Friday, June 23 |
| » Lost to Pirates (37-21), 4-2 | Wrigley Field (20-9) | 34-24 | Lost 2 |
| » Starters: Steve Blass vs Fergie Jenkins | Third | 3 out |
| Saturday, June 24 |
| » Lost to Pirates (38-21), 3-1 | Wrigley Field (20-10) | 34-25 | Lost 3 |
| » Starters: Nelson Briles vs Bill Hands | Third | 4 out |
| Sunday, June 25 |
| » Lost to Pirates (39-21), 9-2 | Wrigley Field (20-11) | 34-26 | Lost 4 |
| » Starters: Dock Ellis vs Burt Hooton | Third | 5 out |
| Monday, June 26 |
| » Defeated Phillies (22-39), 11-1 | Wrigley Field (21-11) | 35-26 | |
| » Starters: Bill Champion vs Rick Reuschel | Third | 4 out |
| Tuesday, June 27 |
| » Defeated Phillies (22-40), 6-3 | Wrigley Field (22-11) | 36-26 | Won 2 |
| » Starters: Jim Nash vs Fergie Jenkins | Third | 3½ out |
| » Lost to Phillies (23-40), 7-4 | Wrigley Field (22-12) | 36-27 | |
| » Starters: Ken Reynolds vs Juan Pizarro | Third | 3½ out |
| Wednesday, June 28 |
| » Lost to Cardinals (32-33), 8-4 | Busch Stadium II (2-3) | 36-28 | Lost 2 |
| » Starters: Bill Hands vs Reggie Cleveland | Third | 3½ out |
| Thursday, June 29 |
| » Lost to Cardinals (33-33), 4-2 | Busch Stadium II (2-4) | 36-29 | Lost 3 |
| » Starters: Burt Hooton vs Rick Wise | Third | 4½ out |
| Friday, June 30 |
| » Defeated Pirates (40-25), 4-3 | Three Rivers Stadium (2-2) | 37-29 | |
| » Starters: Rick Reuschel vs Dock Ellis | Third | 3½ out |
| Saturday, July 1 |
| » Lost to Pirates (41-25), 4-3 | Three Rivers Stadium (2-3) | 37-30 | |
| » Starters: Fergie Jenkins vs Bob Moose | Third | 4½ out |
| Sunday, July 2 |
| » Lost to Pirates (42-25), 7-4 | Three Rivers Stadium (2-4) | 37-31 | Lost 2 |
| » Starters: Bill Hands vs Bruce Kison | Third | 5½ out |
| Monday, July 3 |
| » Lost to Pirates (43-25), 3-2 | Three Rivers Stadium (2-5) | 37-32 | Lost 3 |
| » Starters: Burt Hooton vs Steve Blass | Third | 6½ out |
| Tuesday, July 4 |
| » Lost to Braves (33-38), 5-1 | Atlanta-Fulton County Stadium (1-2) | 37-33 | Lost 4 |
| » Starters: Juan Pizarro vs Ron Reed | Third | 6½ out |
| » Tied Braves, 3-3 | Atlanta-Fulton County Stadium (1-2) | 37-33 | |
| » Starters: Milt Pappas vs Denny McLain | Third | 6½ out |
| Wednesday, July 5 |
| » Defeated Braves (33-39), 4-1 | Atlanta-Fulton County Stadium (2-2) | 38-33 | |
| » Starters: Fergie Jenkins vs Ron Schueler | Third | 7 out |
| » Lost to Braves (34-39), 3-2 | Atlanta-Fulton County Stadium (2-3) | 38-34 | |
| » Starters: Tom Phoebus vs Phil Niekro | Third | 7 out |
| Future Cub Bo Porter is born in Newark, NJ. |
| Thursday, July 6 |
| » Lost to Braves (35-39), 4-3 | Atlanta-Fulton County Stadium (2-4) | 38-35 | Lost 2 |
| » Starters: Bill Hands vs George Stone | Fourth | 8 out |
| Friday, July 7 |
| » Defeated Reds (44-29), 2-1 | Riverfront Stadium (3-0) | 39-35 | |
| » Starters: Burt Hooton vs Wayne Simpson | Fourth | 7½ out |
| Saturday, July 8 |
| » Lost to Reds (45-29), 3-2 | Riverfront Stadium (3-1) | 39-36 | |
| » Starters: Rick Reuschel vs Gary Nolan | Fourth | 8½ out |
| Sunday, July 9 |
| » Defeated Reds (45-30), 5-0 | Riverfront Stadium (4-1) | 40-36 | |
| » Starters: Fergie Jenkins vs Don Gullett | Fourth | 8 out |
| » Defeated Reds (45-31), 10-5 | Riverfront Stadium (5-1) | 41-36 | Won 2 |
| » Starters: Milt Pappas vs Ross Grimsley | Fourth | 8 out |
| Tuesday, July 11 |
| » Lost to Astros (46-33), 6-5 | Wrigley Field (22-13) | 41-37 | |
| » Starters: Ken Forsch vs Burt Hooton | Third | 7½ out |
| » Defeated Astros (46-34), 9-5 | Wrigley Field (23-13) | 42-37 | |
| » Starters: Don Wilson vs Bill Hands | Third | 7½ out |
| Wednesday, July 12 |
| » Lost to Astros (47-34), 10-6 | Wrigley Field (23-14) | 42-38 | |
| » Starters: Dave Roberts vs Rick Reuschel | Fourth | 7½ out |
| Thursday, July 13 |
| » Lost to Astros (48-34), 7-2 | Wrigley Field (23-15) | 42-39 | Lost 2 |
| » Starters: Jerry Reuss vs Fergie Jenkins | Fourth | 7½ out |
| Friday, July 14 |
| » Defeated Braves (37-45), 9-8 | Wrigley Field (24-15) | 43-39 | |
| » Starters: Jim Hardin vs Milt Pappas | Fourth | 7½ out |
| Saturday, July 15 |
| » Lost to Braves (38-45), 4-2 | Wrigley Field (24-16) | 43-40 | |
| » Starters: Phil Niekro vs Bill Hands | Fourth | 8½ out |
| Sunday, July 16 |
| » Defeated Braves (38-46), 5-3 | Wrigley Field (25-16) | 44-40 | |
| » Starters: George Stone vs Burt Hooton | Third | 9 out |
| Monday, July 17 |
| » Lost to Reds (52-31), 7-2 | Wrigley Field (25-17) | 44-41 | |
| » Starters: Wayne Simpson vs Rick Reuschel | Fourth | 10 out |
| Tuesday, July 18 |
| » Defeated Reds (52-32), 2-1 | Wrigley Field (26-17) | 45-41 | |
| » Starters: Gary Nolan vs Fergie Jenkins | Third | 9 out |
| Wednesday, July 19 |
| » Lost to Reds (53-32), 6-1 | Wrigley Field (26-18) | 45-42 | |
| » Starters: Ross Grimsley vs Milt Pappas | Fourth | 10 out |
| Friday, July 21 |
| » Defeated Astros (49-41), 11-3 | Astrodome (1-3) | 46-42 | |
| » Starters: Bill Bonham vs Ken Forsch | Third | 9 out |
| Saturday, July 22 |
| » Lost to Astros (50-41), 7-2 | Astrodome (1-4) | 46-43 | |
| » Starters: Rick Reuschel vs Don Wilson | Third | 9 out |
| Sunday, July 23 |
| » Lost to Astros (51-41), 6-5 | Astrodome (1-5) | 46-44 | Lost 2 |
| » Starters: Fergie Jenkins vs Dave Roberts | Third | 10 out |
| Thursday, July 27 |
| » Defeated Phillies (31-58), 4-0 | Veteran's Stadium (3-1) | 47-44 | |
| » Manager: Whitey Lockman |
| » Starters: Fergie Jenkins vs Ken Reynolds | Fourth | 10 out |
| » Lost to Phillies (32-58), 3-2 | Veteran's Stadium (3-2) | 47-45 | |
| » Starters: Burt Hooton vs Wayne Twitchell | Fourth | 10 out |
| Friday, July 28 |
| » Lost to Phillies (33-58), 2-0 | Veteran's Stadium (3-3) | 47-46 | Lost 2 |
| » Starters: Milt Pappas vs Steve Carlton | Fourth | 11 out |
| Saturday, July 29 |
| » Defeated Cardinals (46-45), 3-2 | Wrigley Field (27-18) | 48-46 | |
| » Starters: Rick Wise vs Bill Hands | Third | 10½ out |
| Sunday, July 30 |
| » Defeated Cardinals (46-46), 4-0 | Wrigley Field (28-18) | 49-46 | Won 2 |
| » Starters: Don Durham vs Rick Reuschel | Third | 10 out |
| » Defeated Cardinals (46-47), 5-4 | Wrigley Field (29-18) | 50-46 | Won 3 |
| » Starters: Dennis Higgins vs Bill Bonham | Third | 10 out |
| » Major-league debuts: Ray Bare (Cardinals) |
| Monday, July 31 |
| » Defeated Cardinals (46-48), 4-0 | Wrigley Field (30-18) | 51-46 | Won 4 |
| » Starters: Reggie Cleveland vs Fergie Jenkins | Third | 10 out |
| Former Cub Rollie Hemsley dies in Washington, DC at the age of 66. |
| Tuesday, August 1 |
| » Lost to Expos (43-50), 3-2 | Parc Jarry (0-1) | 51-47 | |
| » Starters: Burt Hooton vs Bill Stoneman | Third | 10 out |
| Wednesday, August 2 |
| » Defeated Expos (43-51), 5-4 | Parc Jarry (1-1) | 52-47 | |
| » Starters: Milt Pappas vs Mike Torrez | Third | 9 out |
| Thursday, August 3 |
| » Lost to Expos (44-51), 2-1 | Parc Jarry (1-2) | 52-48 | |
| » Starters: Rick Reuschel vs Ernie McAnally | Third | 9½ out |
| » Defeated Expos (44-52), 3-0 | Parc Jarry (2-2) | 53-48 | |
| » Starters: Bill Hands vs Carl Morton | Third | 9½ out |
| Friday, August 4 |
| » Lost to Mets (54-44), 6-1 | Shea Stadium (0-4) | 53-49 | |
| » Starters: Fergie Jenkins vs Jim McAndrew | Third | 9½ out |
| Saturday, August 5 |
| » Defeated Mets (54-45), 3-2 | Shea Stadium (1-4) | 54-49 | |
| » Starters: Bill Bonham vs Jon Matlack | Third | 9½ out |
| Sunday, August 6 |
| » Lost to Mets (55-45), 12-2 | Shea Stadium (1-5) | 54-50 | |
| » Starters: Burt Hooton vs Jerry Koosman | Third | 11 out |
| » Major-league debuts: Lute Barnes (Mets) |
| Tuesday, August 8 |
| » Defeated Expos (45-56), 6-5 | Wrigley Field (31-18) | 55-50 | |
| » Starters: Ernie McAnally vs Fergie Jenkins | Third | 11 out |
| Wednesday, August 9 |
| » Lost to Expos (46-56), 8-2 | Wrigley Field (31-19) | 55-51 | |
| » Starters: Balor Moore vs Bill Hands | Third | 11 out |
| Thursday, August 10 |
| » Defeated Expos (46-57), 8-0 | Wrigley Field (32-19) | 56-51 | |
| » Starters: Bill Stoneman vs Rick Reuschel | Third | 10½ out |
| Friday, August 11 |
| » Defeated Mets (56-48), 7-2 | Wrigley Field (33-19) | 57-51 | Won 2 |
| » Starters: Jon Matlack vs Milt Pappas | Third | 10½ out |
| Future Cub Andrew Lorraine is born in Los Angeles, CA. |
| Saturday, August 12 |
| » Lost to Mets (57-48), 2-1 | Wrigley Field (33-20) | 57-52 | |
| » Starters: Tom Seaver vs Burt Hooton | Third | 11½ out |
| Sunday, August 13 |
| » Defeated Mets (57-49), 7-4 | Wrigley Field (34-20) | 58-52 | |
| » Starters: Jerry Koosman vs Fergie Jenkins | Third | 11 out |
| Tuesday, August 15 |
| » Lost to Giants (50-63), 7-5 | Candlestick Park (2-2) | 58-53 | |
| » Starters: Bill Hands vs Juan Marichal | Third | 11 out |
| Wednesday, August 16 |
| » Lost to Giants (51-63), 14-9 | Candlestick Park (2-3) | 58-54 | Lost 2 |
| » Starters: Rick Reuschel vs Don Carrithers | Third | 12 out |
| Thursday, August 17 |
| » Defeated Giants (51-64), 2-1 | Candlestick Park (3-3) | 59-54 | |
| » Starters: Milt Pappas vs Jim Barr | Third | 11 out |
| Friday, August 18 |
| » Defeated Dodgers (59-52), 5-0 | Dodger Stadium (2-2) | 60-54 | Won 2 |
| » Starters: Fergie Jenkins vs Bill Singer | Third | 11 out |
| Saturday, August 19 |
| » Lost to Dodgers (60-52), 4-2 | Dodger Stadium (2-3) | 60-55 | |
| » Starters: Burt Hooton vs Tommy John | Third | 11½ out |
| Sunday, August 20 |
| » Defeated Dodgers (60-53), 5-3 | Dodger Stadium (3-3) | 61-55 | |
| » Starters: Rick Reuschel vs Claude Osteen | Third | 12 out |
| Monday, August 21 |
| » Lost to Padres (45-70), 6-5 | San Diego/Jack Murphy Stadium (3-1) | 61-56 | |
| » Starters: Bill Hands vs Clay Kirby | Third | 12½ out |
| Tuesday, August 22 |
| » Defeated Padres (45-71), 4-3 | San Diego/Jack Murphy Stadium (4-1) | 62-56 | |
| » Starters: Fergie Jenkins vs Steve Arlin | Third | 12½ out |
| Wednesday, August 23 |
| » Defeated Padres (45-72), 7-5 | San Diego/Jack Murphy Stadium (5-1) | 63-56 | Won 2 |
| » Starters: Milt Pappas vs Bill Greif | Third | 11½ out |
| Thursday, August 24 |
| Future Cub Kurt Miller is born in Tucson, AZ. |
| Friday, August 25 |
| » Lost to Giants (54-67), 11-2 | Wrigley Field (34-21) | 63-57 | |
| » Starters: Jim Willoughby vs Rick Reuschel | Third | 12 out |
| Saturday, August 26 |
| » Defeated Giants (54-68), 10-9 | Wrigley Field (35-21) | 64-57 | |
| » Starters: Ron Bryant vs Fergie Jenkins | Second | 11 out |
| Sunday, August 27 |
| » Defeated Giants (54-69), 9-3 | Wrigley Field (36-21) | 65-57 | Won 2 |
| » Starters: Frank Reberger vs Bill Hands | Second | 10 out |
| » Major-league debuts: Jim Tyrone (Cubs) |
| Tuesday, August 29 |
| » Defeated Dodgers (65-56), 2-1 | Wrigley Field (37-21) | 66-57 | Won 3 |
| » Starters: Bill Singer vs Milt Pappas | Second | 10½ out |
| Wednesday, August 30 |
| » Defeated Dodgers (65-57), 9-8 | Wrigley Field (38-21) | 67-57 | Won 4 |
| » Starters: Tommy John vs Fergie Jenkins | Second | 10½ out |
| Thursday, August 31 |
| » Lost to Dodgers (66-57), 5-3 | Wrigley Field (38-22) | 67-58 | |
| » Starters: Claude Osteen vs Rick Reuschel | Second | 11 out |
| Friday, September 1 |
| » Defeated Padres (46-79), 14-3 | Wrigley Field (39-22) | 68-58 | |
| » Starters: Bill Greif vs Bill Hands | Second | 11 out |
| » Major-league debuts: Al Montreuil (Cubs) |
| Future Cub Kevin Orie is born in West Chester, PA. |
| Saturday, September 2 |
| » Defeated Padres (46-80), 8-0 | Wrigley Field (40-22) | 69-58 | Won 2 |
| » Starters: Mike Caldwell vs Milt Pappas | Second | 11 out |
| Former Cub Jim Brillheart dies in Radford, VA at the age of 69. |
| Sunday, September 3 |
| » Lost to Padres (47-80), 3-0 | Wrigley Field (40-23) | 69-59 | |
| » Starters: Fred Norman vs Burt Hooton | Second | 12 out |
| Monday, September 4 |
| » Defeated Mets (65-60), 2-0 | Shea Stadium (2-5) | 70-59 | |
| » Starters: Fergie Jenkins vs Jon Matlack | Second | 13 out |
| » Lost to Mets (66-60), 7-2 | Shea Stadium (2-6) | 70-60 | |
| » Starters: Juan Pizarro vs Gary Gentry | Second | 13 out |
| Former Cub Bob Bowman dies in Bluefield, WV at the age of 62. |
| Tuesday, September 5 |
| » Defeated Mets (66-61), 3-0 | Shea Stadium (3-6) | 71-60 | |
| » Starters: Rick Reuschel vs Tom Seaver | Second | 12½ out |
| » Major-league debuts: Hank Webb (Mets) |
| Wednesday, September 6 |
| » Lost to Pirates (83-46), 4-0 | Three Rivers Stadium (2-6) | 71-61 | |
| » Starters: Dan McGinn vs Dock Ellis | Second | 13½ out |
| » Major-league debuts: Pete LaCock (Cubs) |
| Thursday, September 7 |
| » Defeated Pirates (83-47), 4-2 | Three Rivers Stadium (3-6) | 72-61 | |
| » Starters: Burt Hooton vs Nelson Briles | Second | 12½ out |
| Friday, September 8 |
| » Defeated Phillies (49-84), 4-3 | Veteran's Stadium (4-3) | 73-61 | Won 2 |
| » Starters: Fergie Jenkins vs Dave Downs | Second | 13 out |
| Saturday, September 9 |
| » Defeated Phillies (49-85), 7-4 | Veteran's Stadium (5-3) | 74-61 | Won 3 |
| » Starters: Rick Reuschel vs Wayne Twitchell | Second | 13 out |
| » Major-league debuts: Craig Robinson (Phillies) |
| Sunday, September 10 |
| » Defeated Phillies (49-86), 5-3 | Veteran's Stadium (6-3) | 75-61 | Won 4 |
| » Starters: Milt Pappas vs Jim Nash | Second | 12 out |
| » Major-league debuts: Bob Boone (Phillies) Dave Rosello (Cubs) |
| Tuesday, September 12 |
| » Lost to Pirates (87-48), 7-0 | Wrigley Field (40-24) | 75-62 | |
| » Starters: Dock Ellis vs Burt Hooton | Second | 13 out |
| Wednesday, September 13 |
| » Lost to Pirates (88-48), 6-4 | Wrigley Field (40-25) | 75-63 | Lost 2 |
| » Starters: Nelson Briles vs Fergie Jenkins | Second | 14 out |
| Thursday, September 14 |
| » Lost to Pirates (89-48), 5-2 | Wrigley Field (40-26) | 75-64 | Lost 3 |
| » Starters: Bob Moose vs Rick Reuschel | Second | 15 out |
| Friday, September 15 |
| » Defeated Mets (72-65), 9-3 | Wrigley Field (41-26) | 76-64 | |
| » Starters: Gary Gentry vs Milt Pappas | Second | 14 out |
| » Major-league debuts: Tommy Moore (Mets) |
| Saturday, September 16 |
| » Defeated Mets (72-66), 18-5 | Wrigley Field (42-26) | 77-64 | Won 2 |
| » Starters: Tom Seaver vs Burt Hooton | Second | 13 out |
| Former Cub Eddie Waitkus dies in Jamaica Plain, MA at the age of 54. |
| Sunday, September 17 |
| » Defeated Mets (72-67), 6-4 | Wrigley Field (43-26) | 78-64 | Won 3 |
| » Starters: Jim McAndrew vs Bill Hands | Second | 12 out |
| Tuesday, September 19 |
| » Lost to Expos (65-77), 7-2 | Wrigley Field (43-27) | 78-65 | |
| » Starters: Bill Stoneman vs Fergie Jenkins | Second | 12½ out |
| Wednesday, September 20 |
| » Defeated Expos (65-78), 6-2 | Wrigley Field (44-27) | 79-65 | |
| » Starters: Mike Torrez vs Milt Pappas | Second | 11½ out |
| Saturday, September 23 |
| » Defeated Cardinals (70-77), 2-0 | Busch Stadium II (3-4) | 80-65 | Won 2 |
| » Starters: Burt Hooton vs Bob Gibson | Second | 11 out |
| » Defeated Cardinals (70-78), 15-1 | Busch Stadium II (4-4) | 81-65 | Won 3 |
| » Starters: Joe Decker vs Reggie Cleveland | Second | 11 out |
| Sunday, September 24 |
| » Lost to Cardinals (71-78), 2-1 | Busch Stadium II (4-5) | 81-66 | |
| » Starters: Bill Hands vs Rick Wise | Second | 11 out |
| Tuesday, September 26 |
| » Defeated Expos (67-80), 6-0 | Parc Jarry (3-2) | 82-66 | |
| » Starters: Milt Pappas vs Bill Stoneman | Second | 11 out |
| Wednesday, September 27 |
| » Defeated Expos (67-81), 8-0 | Parc Jarry (4-2) | 83-66 | Won 2 |
| » Starters: Rick Reuschel vs Steve Renko | Second | 11 out |
| Friday, September 29 |
| » Lost to Cardinals (73-79), 4-1 | Wrigley Field (44-28) | 83-67 | |
| » Starters: Bob Gibson vs Burt Hooton | Second | 10½ out |
| Saturday, September 30 |
| » Lost to Cardinals (74-79), 2-1 | Wrigley Field (44-29) | 83-68 | Lost 2 |
| » Starters: Rick Wise vs Bill Hands | Second | 11½ out |
| Future Cub Curtis Goodwin is born in Oakland, CA. |
| S |