| Tuesday, January 11 |
| Former Cub Tex Carleton dies in Fort Worth, TX at the age of 71. |
| Saturday, February 19 |
| Former Cub Mike Gonzales dies in Havana, Cuba at the age of 87. |
| Wednesday, April 6 |
| » Major-league debuts: Jose Baez (Mariners) |
| Thursday, April 7 |
| » Lost to Mets (1-0), 5-3 | Wrigley Field (0-1) | 0-1 | |
| » W: Tom Seaver (1-0) L: Ray Burris (0-1) S: Skip Lockwood (1) | Third | 1 out |
| » Major-league debuts: Mike Gordon (Cubs) |
| Saturday, April 9 |
| » Lost to Mets (2-0), 8-6 | Wrigley Field (0-2) | 0-2 | Lost 2 |
| » W: Nino Espinosa (1-0) L: Jim Todd (0-1) | Fourth | 2 out |
| » Major-league debuts: Willie Hernandez (Cubs) |
| Sunday, April 10 |
| » Defeated Mets (2-1), 5-2 | Wrigley Field (1-2) | 1-2 | |
| » W: Rick Reuschel (1-0) L: Jon Matlack (0-1) S: Bruce Sutter (1) | Fourth | 2 out |
| Monday, April 11 |
| » Defeated Phillies (0-3), 6-2 | Veteran's Stadium (1-0) | 2-2 | Won 2 |
| » W: Bill Bonham (1-0) L: Wayne Twitchell (0-1) | Fourth | 1½ out |
| Wednesday, April 13 |
| » Defeated Phillies (0-4), 3-1 | Veteran's Stadium (2-0) | 3-2 | Won 3 |
| » W: Ray Burris (1-1) L: Randy Lerch (0-1) S: Bruce Sutter (2) | Second | 1 out |
| Friday, April 15 |
| » Defeated Mets (3-4), 8-4 | Shea Stadium (1-0) | 4-2 | Won 4 |
| » W: Paul Reuschel (1-0) L: Skip Lockwood (0-1) | Second | ½ out |
| Saturday, April 16 |
| » Lost to Mets (4-4), 4-1 | Shea Stadium (1-1) | 4-3 | |
| » W: Nino Espinosa (2-0) L: Rick Reuschel (1-1) | Second | ½ out |
| Sunday, April 17 |
| » Lost to Mets (5-4), 6-0 | Shea Stadium (1-2) | 4-4 | Lost 2 |
| » W: Tom Seaver (3-0) L: Bill Bonham (1-1) | Fourth | 1½ out |
| Monday, April 18 |
| » Lost to Phillies (2-6), 3-1 | Wrigley Field (1-3) | 4-5 | Lost 3 |
| » W: Randy Lerch (1-1) L: Ray Burris (1-2) S: Ron Reed (1) | Fourth | 2½ out |
| Tuesday, April 19 |
| » Lost to Phillies (3-6), 7-5 | Wrigley Field (1-4) | 4-6 | Lost 4 |
| » W: Larry Christenson (1-1) L: Mike Krukow (0-1) S: Gene Garber (1) | Fourth | 2½ out |
| Saturday, April 23 |
| » Defeated Reds (4-9), 2-1 | Wrigley Field (2-4) | 5-6 | |
| » W: Bill Bonham (2-1) L: Pat Zachry (1-2) S: Bruce Sutter (3) | Fourth | 2½ out |
| Sunday, April 24 |
| » Defeated Reds (4-10), 7-1 | Wrigley Field (3-4) | 6-6 | Won 2 |
| » W: Ray Burris (2-2) L: Woodie Fryman (1-2) | Third | 1½ out |
| Tuesday, April 26 |
| » Defeated Cardinals (9-7), 4-1 | Wrigley Field (4-4) | 7-6 | Won 3 |
| » W: Rick Reuschel (2-1) L: Eric Rasmussen (1-3) | Third | ½ out |
| Wednesday, April 27 |
| » Lost to Cardinals (10-7), 21-3 | Wrigley Field (4-5) | 7-7 | |
| » W: John Denny (5-0) L: Mike Krukow (0-2) | Fourth | 1½ out |
| Friday, April 29 |
| » Lost to Reds (8-10), 3-2 | Riverfront Stadium (0-1) | 7-8 | Lost 2 |
| » W: Woodie Fryman (2-2) L: Bill Bonham (2-2) S: Rawly Eastwick (4) | Fourth | 2½ out |
| Saturday, April 30 |
| » Lost to Reds (9-10), 8-0 | Riverfront Stadium (0-2) | 7-9 | Lost 3 |
| » W: Jack Billingham (3-1) L: Ray Burris (2-3) | Fifth | 3½ out |
| Sunday, May 1 |
| » Defeated Reds (9-11), 4-1 | Riverfront Stadium (1-2) | 8-9 | |
| » W: Rick Reuschel (3-1) L: Pat Zachry (2-3) S: Bruce Sutter (4) | Fifth | 3½ out |
| Tuesday, May 3 |
| » Defeated Astros (9-13), 9-0 | Wrigley Field (5-5) | 9-9 | Won 2 |
| » W: Ray Burris (3-3) L: J.R. Richard (1-3) | Fourth | 3 out |
| Future Cub Ryan Dempster is born in Sechelt, BC. |
| Wednesday, May 4 |
| » Lost to Astros (10-13), 5-4 | Wrigley Field (5-6) | 9-10 | |
| » W: Ken Forsch (3-2) L: Bruce Sutter (0-1) S: Bo McLaughlin (1) | Fourth | 4 out |
| Thursday, May 5 |
| » Defeated Astros (10-14), 8-7 | Wrigley Field (6-6) | 10-10 | |
| » W: Rick Reuschel (4-1) L: Floyd Bannister (1-2) S: Bruce Sutter (5) | Fourth | 3½ out |
| Friday, May 6 |
| » Defeated Braves (8-17), 7-2 | Wrigley Field (7-6) | 11-10 | Won 2 |
| » W: Mike Krukow (1-2) L: Buzz Capra (0-2) S: Paul Reuschel (1) | Third | 3½ out |
| » Major-league debuts: Dave Campbell (Braves) |
| Saturday, May 7 |
| » Defeated Braves (8-18), 11-4 | Wrigley Field (8-6) | 12-10 | Won 3 |
| » W: Ray Burris (4-3) L: Phil Niekro (0-6) | Third | 3½ out |
| Sunday, May 8 |
| » Defeated Braves (8-19), 6-3 | Wrigley Field (9-6) | 13-10 | Won 4 |
| » W: Bill Bonham (3-2) L: Max Leon (0-1) S: Bruce Sutter (6) | Third | 3½ out |
| Monday, May 9 |
| » Defeated Astros (11-17), 6-1 | Astrodome (1-0) | 14-10 | Won 5 |
| » W: Rick Reuschel (5-1) L: Joaquin Andujar (2-2) S: Guillermo Hernandez (1) | Third | 3 out |
| Tuesday, May 10 |
| » Defeated Astros (11-18), 11-5 | Astrodome (2-0) | 15-10 | Won 6 |
| » W: Mike Krukow (2-2) L: Floyd Bannister (1-3) | Third | 3½ out |
| Wednesday, May 11 |
| » Lost to Astros (12-18), 8-2 | Astrodome (2-1) | 15-11 | |
| » W: J.R. Richard (2-3) L: Ray Burris (4-4) | Third | 4½ out |
| Friday, May 13 |
| » Defeated Expos (13-13), 5-3 | Stade Olympique (1-0) | 16-11 | |
| » W: Bill Bonham (4-2) L: Dan Warthen (1-1) S: Bruce Sutter (7) | Third | 3 out |
| Saturday, May 14 |
| » Defeated Expos (13-14), 6-3 | Stade Olympique (2-0) | 17-11 | Won 2 |
| » W: Rick Reuschel (6-1) L: Steve Rogers (4-2) S: Bruce Sutter (8) | Third | 3 out |
| Sunday, May 15 |
| » Defeated Expos (13-15), 4-3 | Stade Olympique (3-0) | 18-11 | Won 3 |
| » W: Ray Burris (5-4) L: Don Stanhouse (3-5) S: Bruce Sutter (9) | Second | 2½ out |
| » Defeated Expos (13-16), 4-2 | Stade Olympique (4-0) | 19-11 | Won 4 |
| » W: Mike Krukow (3-2) L: Jackie Brown (1-3) S: Paul Reuschel (2) | Second | 2½ out |
| Monday, May 16 |
| » Defeated Padres (14-23), 9-6 | Wrigley Field (10-6) | 20-11 | Won 5 |
| » W: Jim Todd (1-1) L: Bob Shirley (2-5) S: Paul Reuschel (3) | Second | 2 out |
| Tuesday, May 17 |
| » Defeated Padres (14-24), 23-6 | Wrigley Field (11-6) | 21-11 | Won 6 |
| » W: Bill Bonham (5-2) L: Tom Griffin (3-2) S: Ramon Hernandez (1) | Second | 2 out |
| Thursday, May 19 |
| » Lost to Braves (13-24), 6-0 | Atlanta-Fulton County Stadium (0-1) | 21-12 | |
| » W: Phil Niekro (2-7) L: Rick Reuschel (6-2) | Second | 2½ out |
| Friday, May 20 |
| » Defeated Braves (13-25), 13-4 | Atlanta-Fulton County Stadium (1-1) | 22-12 | |
| » W: Ray Burris (6-4) L: Don Collins (0-3) | Second | 1½ out |
| Saturday, May 21 |
| » Defeated Braves (13-26), 9-3 | Atlanta-Fulton County Stadium (2-1) | 23-12 | Won 2 |
| » W: Donnie Moore (1-0) L: Max Leon (1-2) S: Bruce Sutter (10) | Second | ½ out |
| Sunday, May 22 |
| » Lost to Braves (14-26), 5-2 | Atlanta-Fulton County Stadium (2-2) | 23-13 | |
| » W: Andy Messersmith (3-1) L: Bill Bonham (5-3) S: Jamie Easterly (1) | Second | 1½ out |
| Tuesday, May 24 |
| » Lost to Expos (15-21), 5-4 | Wrigley Field (11-7) | 23-14 | Lost 2 |
| » W: Joe Kerrigan (1-0) L: Guillermo Hernandez (0-1) S: Santo Alcala (1) | Second | 2½ out |
| Wednesday, May 25 |
| » Defeated Expos (15-22), 7-3 | Wrigley Field (12-7) | 24-14 | |
| » W: Ray Burris (7-4) L: Dan Warthen (1-2) S: Bruce Sutter (11) | Second | 2 out |
| Thursday, May 26 |
| » Defeated Expos (15-23), 1-0 | Wrigley Field (13-7) | 25-14 | Won 2 |
| » W: Mike Krukow (4-2) L: Steve Rogers (5-4) | Second | 1½ out |
| Friday, May 27 |
| » Defeated Pirates (26-13), 4-2 | Wrigley Field (14-7) | 26-14 | Won 3 |
| » W: Bill Bonham (6-3) L: John Candelaria (6-1) S: Bruce Sutter (12) | Second | ½ out |
| Saturday, May 28 |
| » Defeated Pirates (26-14), 6-3 | Wrigley Field (15-7) | 27-14 | Won 4 |
| » W: Paul Reuschel (2-0) L: Jim Rooker (4-3) S: Bruce Sutter (13) | First | -- |
| Sunday, May 29 |
| » Defeated Pirates (26-15), 3-2 | Wrigley Field (16-7) | 28-14 | Won 5 |
| » W: Guillermo Hernandez (1-1) L: Rich Gossage (4-1) S: Bruce Sutter (14) | First | -- |
| Monday, May 30 |
| » Lost to Cardinals (27-18), 14-0 | Busch Stadium II (0-1) | 28-15 | |
| » W: Pete Falcone (2-5) L: Mike Krukow (4-3) | First | -- |
| Tuesday, May 31 |
| » Lost to Cardinals (28-18), 6-0 | Busch Stadium II (0-2) | 28-16 | Lost 2 |
| » W: John Denny (7-0) L: Bill Bonham (6-4) | First | -- |
| Wednesday, June 1 |
| » Defeated Cardinals (28-19), 4-3 | Busch Stadium II (1-2) | 29-16 | |
| » W: Guillermo Hernandez (2-1) L: Buddy Schultz (3-1) | First | -- |
| Friday, June 3 |
| » Lost to Pirates (28-17), 5-0 | Three Rivers Stadium (0-1) | 29-17 | |
| » W: Jim Rooker (5-3) L: Ray Burris (7-5) | First | -- |
| Saturday, June 4 |
| » Defeated Pirates (28-18), 4-3 | Three Rivers Stadium (1-1) | 30-17 | |
| » W: Mike Krukow (5-3) L: Jerry Reuss (1-6) S: Bruce Sutter (15) | First | -- |
| Sunday, June 5 |
| » Lost to Pirates (29-18), 5-4 | Three Rivers Stadium (1-2) | 30-18 | |
| » W: Odell Jones (2-1) L: Bill Bonham (6-5) S: Rich Gossage (9) | First | -- |
| Monday, June 6 |
| » Defeated Dodgers (36-17), 3-1 | Wrigley Field (17-7) | 31-18 | |
| » W: Rick Reuschel (7-2) L: Burt Hooton (4-3) S: Bruce Sutter (16) | First | -- |
| Tuesday, June 7 |
| » Defeated Dodgers (36-18), 10-4 | Wrigley Field (18-7) | 32-18 | Won 2 |
| » W: Ray Burris (8-5) L: Tommy John (6-3) | First | -- |
| Wednesday, June 8 |
| » Lost to Dodgers (37-18), 4-2 | Wrigley Field (18-8) | 32-19 | |
| » W: Don Sutton (7-2) L: Mike Krukow (5-4) | First | -- |
| Thursday, June 9 |
| » Defeated Giants (26-31), 1-0 | Wrigley Field (19-8) | 33-19 | |
| » W: Bruce Sutter (1-1) L: Randy Moffitt (1-3) | First | -- |
| Friday, June 10 |
| » Defeated Giants (26-32), 3-1 | Wrigley Field (20-8) | 34-19 | Won 2 |
| » W: Rick Reuschel (8-2) L: Bob Knepper (0-1) | First | -- |
| Saturday, June 11 |
| » Defeated Giants (26-33), 5-3 | Wrigley Field (21-8) | 35-19 | Won 3 |
| » W: Guillermo Hernandez (3-1) L: Gary Lavelle (5-3) S: Bruce Sutter (17) | First | -- |
| Sunday, June 12 |
| » Defeated Giants (26-34), 6-5 | Wrigley Field (22-8) | 36-19 | Won 4 |
| » W: Bruce Sutter (2-1) L: Gary Lavelle (5-4) | First | -- |
| Tuesday, June 14 |
| » Defeated Padres (27-37), 6-5 | San Diego/Jack Murphy Stadium (1-0) | 37-19 | Won 5 |
| » W: Donnie Moore (2-0) L: Rollie Fingers (4-3) | First | -- |
| Wednesday, June 15 |
| » Defeated Padres (27-38), 2-0 | San Diego/Jack Murphy Stadium (2-0) | 38-19 | Won 6 |
| » W: Rick Reuschel (9-2) L: Bob Owchinko (1-1) | First | -- |
| Former Cub Bill Lee dies in Plaquemine, LA at the age of 68. |
| Thursday, June 16 |
| » Lost to Padres (28-38), 8-6 | San Diego/Jack Murphy Stadium (2-1) | 38-20 | |
| » W: Bob Shirley (6-6) L: Ray Burris (8-6) S: Dan Spillner (2) | First | -- |
| Friday, June 17 |
| » Defeated Dodgers (41-22), 7-3 | Dodger Stadium (1-0) | 39-20 | |
| » W: Bruce Sutter (3-1) L: Stan Wall (2-3) | First | -- |
| Future Cub Kerry Wood is born in Irving, TX. |
| Saturday, June 18 |
| » Lost to Dodgers (42-22), 2-1 | Dodger Stadium (1-1) | 39-21 | |
| » W: Tommy John (7-4) L: Bill Bonham (6-6) | First | -- |
| Sunday, June 19 |
| » Lost to Dodgers (43-22), 3-1 | Dodger Stadium (1-2) | 39-22 | Lost 2 |
| » W: Don Sutton (8-2) L: Guillermo Hernandez (3-2) | First | -- |
| Monday, June 20 |
| » Defeated Giants (32-36), 10-9 | Candlestick Park (1-0) | 40-22 | |
| » W: Donnie Moore (3-0) L: Terry Cornutt (0-2) S: Rick Reuschel (1) | First | -- |
| Tuesday, June 21 |
| » Defeated Giants (32-37), 8-2 | Candlestick Park (2-0) | 41-22 | Won 2 |
| » W: Mike Krukow (6-4) L: Jack Curtis (2-2) S: Steve Renko (1) | First | -- |
| Wednesday, June 22 |
| » Defeated Giants (32-38), 4-2 | Candlestick Park (3-0) | 42-22 | Won 3 |
| » W: Bill Bonham (7-6) L: Ed Halicki (6-6) S: Bruce Sutter (18) | First | -- |
| Friday, June 24 |
| » Defeated Mets (29-39), 5-0 | Wrigley Field (23-8) | 43-22 | Won 4 |
| » W: Rick Reuschel (10-2) L: Jerry Koosman (5-8) S: Guillermo Hernandez (2) | First | -- |
| Saturday, June 25 |
| » Defeated Mets (29-40), 5-4 | Wrigley Field (24-8) | 44-22 | Won 5 |
| » W: Ray Burris (9-6) L: Bob Apodaca (2-3) | First | -- |
| Sunday, June 26 |
| » Defeated Mets (29-41), 5-2 | Wrigley Field (25-8) | 45-22 | Won 6 |
| » W: Mike Krukow (7-4) L: Jon Matlack (3-9) S: Bruce Sutter (19) | First | -- |
| Monday, June 27 |
| » Defeated Expos (29-40), 4-3 | Stade Olympique (5-0) | 46-22 | Won 7 |
| » W: Bill Bonham (8-6) L: Santo Alcala (2-6) S: Bruce Sutter (20) | First | -- |
| Tuesday, June 28 |
| » Defeated Expos (29-41), 4-2 | Stade Olympique (6-0) | 47-22 | Won 8 |
| » W: Rick Reuschel (11-2) L: Will McEnaney (2-2) S: Bruce Sutter (21) | First | -- |
| Wednesday, June 29 |
| » Lost to Expos (30-41), 5-0 | Stade Olympique (6-1) | 47-23 | |
| » W: Jackie Brown (5-6) L: Ray Burris (9-7) | First | -- |
| Thursday, June 30 |
| » Lost to Cardinals (41-33), 2-1 | Busch Stadium II (1-3) | 47-24 | Lost 2 |
| » W: Rawly Eastwick (3-2) L: Guillermo Hernandez (3-3) | First | -- |
| Friday, July 1 |
| » Lost to Cardinals (42-33), 3-1 | Busch Stadium II (1-4) | 47-25 | Lost 3 |
| » W: Larry Dierker (2-4) L: Mike Krukow (7-5) S: Rawly Eastwick (9) | First | -- |
| Saturday, July 2 |
| » Lost to Cardinals (43-33), 10-3 | Busch Stadium II (1-5) | 47-26 | Lost 4 |
| » W: Pete Falcone (4-6) L: Bill Bonham (8-7) | First | -- |
| Sunday, July 3 |
| » Defeated Cardinals (43-34), 4-0 | Busch Stadium II (2-5) | 48-26 | |
| » W: Bruce Sutter (4-1) L: Eric Rasmussen (6-10) | First | -- |
| Monday, July 4 |
| » Lost to Expos (35-42), 19-3 | Wrigley Field (25-9) | 48-27 | |
| » W: Jackie Brown (6-6) L: Ray Burris (9-8) | First | -- |
| » Lost to Expos (36-42), 7-6 | Wrigley Field (25-10) | 48-28 | Lost 2 |
| » W: Bill Atkinson (4-1) L: Paul Reuschel (2-1) S: Will McEnaney (2) | First | -- |
| Tuesday, July 5 |
| » Lost to Expos (37-42), 9-8 | Wrigley Field (25-11) | 48-29 | Lost 3 |
| » W: Stan Bahnsen (4-4) L: Mike Krukow (7-6) S: Will McEnaney (3) | First | -- |
| Wednesday, July 6 |
| » Defeated Expos (37-43), 8-6 | Wrigley Field (26-11) | 49-29 | |
| » W: Bill Bonham (9-7) L: Don Stanhouse (5-8) S: Bruce Sutter (22) | First | -- |
| Thursday, July 7 |
| » Defeated Cardinals (44-38), 2-0 | Wrigley Field (27-11) | 50-29 | Won 2 |
| » W: Rick Reuschel (12-2) L: Larry Dierker (2-5) | First | -- |
| Friday, July 8 |
| » Defeated Cardinals (44-39), 7-6 | Wrigley Field (28-11) | 51-29 | Won 3 |
| » W: Paul Reuschel (3-1) L: Rawly Eastwick (3-4) S: Bruce Sutter (23) | First | -- |
| Saturday, July 9 |
| » Lost to Cardinals (45-39), 4-3 | Wrigley Field (28-12) | 51-30 | |
| » W: Tom Underwood (5-4) L: Steve Renko (0-1) S: Clay Carroll (3) | First | -- |
| Sunday, July 10 |
| » Lost to Cardinals (46-39), 8-3 | Wrigley Field (28-13) | 51-31 | Lost 2 |
| » W: Bob Forsch (11-4) L: Bill Bonham (9-8) | First | -- |
| » Defeated Cardinals (46-40), 4-3 | Wrigley Field (29-13) | 52-31 | |
| » W: Bruce Sutter (5-1) L: Al Hrabosky (2-4) | First | -- |
| Tuesday, July 12 |
| » Lost to Mets (34-52), 4-2 | Shea Stadium (1-3) | 52-32 | |
| » W: Jon Matlack (4-11) L: Rick Reuschel (12-3) S: Skip Lockwood (14) | First | -- |
| Wednesday, July 13 |
| » Defeated Mets (34-53), 5-2 | Shea Stadium (2-3) | 53-32 | |
| » W: Ray Burris (10-8) L: Jerry Koosman (6-11) | First | -- |
| Friday, July 15 |
| » Lost to Phillies (50-37), 4-2 | Veteran's Stadium (2-1) | 53-33 | |
| » W: Larry Christenson (8-5) L: Bill Bonham (9-9) S: Tug McGraw (4) | First | -- |
| » Lost to Phillies (51-37), 9-2 | Veteran's Stadium (2-2) | 53-34 | Lost 2 |
| » W: Jim Lonborg (3-3) L: Mike Krukow (7-7) | First | -- |
| Saturday, July 16 |
| » Defeated Phillies (51-38), 9-8 | Veteran's Stadium (3-2) | 54-34 | |
| » W: Pete Broberg (1-0) L: Ron Reed (6-4) S: Bruce Sutter (24) | First | -- |
| Sunday, July 17 |
| » Lost to Phillies (52-38), 4-2 | Veteran's Stadium (3-3) | 54-35 | |
| » W: Steve Carlton (13-4) L: Ray Burris (10-9) S: Tug McGraw (5) | First | -- |
| Thursday, July 21 |
| » Defeated Braves (34-58), 4-3 | Wrigley Field (30-13) | 55-35 | |
| » W: Paul Reuschel (4-1) L: Rick Camp (5-2) | First | -- |
| Friday, July 22 |
| » Defeated Braves (34-59), 1-0 | Wrigley Field (31-13) | 56-35 | Won 2 |
| » W: Rick Reuschel (13-3) L: Dick Ruthven (3-6) | First | -- |
| Saturday, July 23 |
| » Lost to Braves (35-59), 5-4 | Wrigley Field (31-14) | 56-36 | |
| » W: Rick Camp (6-2) L: Paul Reuschel (4-2) | First | -- |
| Sunday, July 24 |
| » Lost to Astros (45-52), 10-6 | Wrigley Field (31-15) | 56-37 | Lost 2 |
| » W: Gene Pentz (3-1) L: Ray Burris (10-10) S: Joe Sambito (3) | First | -- |
| » Lost to Astros (46-52), 6-4 | Wrigley Field (31-16) | 56-38 | Lost 3 |
| » W: Joe Niekro (5-3) L: Donnie Moore (3-1) | First | -- |
| Future Cub Jason Smith is born in Meridian, MS. |
| Monday, July 25 |
| » Defeated Astros (46-53), 9-7 | Wrigley Field (32-16) | 57-38 | |
| » W: Guillermo Hernandez (4-3) L: Mark Lemongello (3-12) | First | -- |
| Tuesday, July 26 |
| » Defeated Reds (48-47), 3-0 | Wrigley Field (33-16) | 58-38 | Won 2 |
| » W: Rick Reuschel (14-3) L: Fred Norman (9-7) | First | -- |
| Wednesday, July 27 |
| » Lost to Reds (49-47), 6-2 | Wrigley Field (33-17) | 58-39 | |
| » W: Mario Soto (1-0) L: Mike Krukow (7-8) | First | -- |
| » Defeated Reds (49-48), 5-1 | Wrigley Field (34-17) | 59-39 | |
| » W: Steve Renko (1-1) L: Doug Capilla (2-3) | First | -- |
| Thursday, July 28 |
| » Defeated Reds (49-49), 16-15 | Wrigley Field (35-17) | 60-39 | Won 2 |
| » W: Rick Reuschel (15-3) L: Jack Billingham (8-8) | First | -- |
| Friday, July 29 |
| » Lost to Astros (47-56), 1-0 | Astrodome (2-2) | 60-40 | |
| » W: Joe Niekro (6-3) L: Bill Bonham (9-10) | First | -- |
| Saturday, July 30 |
| » Lost to Astros (48-56), 11-3 | Astrodome (2-3) | 60-41 | Lost 2 |
| » W: Joe Sambito (5-3) L: Paul Reuschel (4-3) | First | -- |
| » Major-league debuts: Tom Dixon (Astros) |
| Sunday, July 31 |
| » Defeated Astros (48-57), 4-1 | Astrodome (3-3) | 61-41 | |
| » W: Ray Burris (11-10) L: J.R. Richard (9-9) | First | -- |
| Monday, August 1 |
| » Lost to Reds (52-51), 7-6 | Riverfront Stadium (1-3) | 61-42 | |
| » W: Pedro Borbon (6-4) L: Paul Reuschel (4-4) | First | -- |
| Tuesday, August 2 |
| » Defeated Reds (52-52), 5-2 | Riverfront Stadium (2-3) | 62-42 | |
| » W: Guillermo Hernandez (5-3) L: Mario Soto (1-1) S: Dave Roberts (1) | First | -- |
| Wednesday, August 3 |
| » Lost to Reds (53-52), 5-3 | Riverfront Stadium (2-4) | 62-43 | |
| » W: Pedro Borbon (7-4) L: Guillermo Hernandez (5-4) | First | -- |
| Friday, August 5 |
| » Lost to Padres (47-64), 11-8 | Wrigley Field (35-18) | 62-44 | Lost 2 |
| » W: Dave Tomlin (3-4) L: Ray Burris (11-11) S: Rollie Fingers (24) | Second | ½ out |
| Saturday, August 6 |
| » Defeated Padres (47-65), 10-5 | Wrigley Field (36-18) | 63-44 | |
| » W: Bill Bonham (10-10) L: Randy Jones (4-8) S: Paul Reuschel (4) | Second | ½ out |
| Sunday, August 7 |
| » Lost to Padres (48-65), 8-6 | Wrigley Field (36-19) | 63-45 | |
| » W: Bob Owchinko (5-7) L: Mike Krukow (7-9) S: Dan Spillner (5) | Second | 1 out |
| » Defeated Padres (48-66), 9-4 | Wrigley Field (37-19) | 64-45 | |
| » W: Steve Renko (2-1) L: Bob Shirley (6-14) | Second | 1 out |
| Monday, August 8 |
| » Lost to Pirates (63-48), 7-6 | Three Rivers Stadium (1-3) | 64-46 | |
| » W: Grant Jackson (5-3) L: Rick Reuschel (15-4) | Second | 1½ out |
| Tuesday, August 9 |
| » Defeated Pirates (63-49), 4-1 | Three Rivers Stadium (2-3) | 65-46 | |
| » W: Ray Burris (12-11) L: Jerry Reuss (7-11) S: Guillermo Hernandez (3) | Second | 1 out |
| Wednesday, August 10 |
| » Lost to Pirates (64-49), 2-1 | Three Rivers Stadium (2-4) | 65-47 | |
| » W: Larry Demery (4-3) L: Pete Broberg (1-1) | Second | 2½ out |
| Friday, August 12 |
| » Lost to Phillies (68-44), 10-3 | Wrigley Field (37-20) | 65-48 | Lost 2 |
| » W: Steve Carlton (17-6) L: Rick Reuschel (15-5) | Third | 4 out |
| Saturday, August 13 |
| » Lost to Phillies (69-44), 10-7 | Wrigley Field (37-21) | 65-49 | Lost 3 |
| » W: Ron Reed (7-4) L: Dave Giusti (3-4) S: Gene Garber (13) | Third | 5 out |
| Future Cub Will Ohman is born in Frankfurt, W.Germany. |
| Sunday, August 14 |
| » Lost to Phillies (70-44), 10-2 | Wrigley Field (37-22) | 65-50 | Lost 4 |
| » W: Larry Christenson (11-5) L: Mike Krukow (7-10) | Third | 7 out |
| » Lost to Phillies (71-44), 4-2 | Wrigley Field (37-23) | 65-51 | Lost 5 |
| » W: Jim Lonborg (7-3) L: Steve Renko (2-2) S: Ron Reed (12) | Third | 7 out |
| Future Cub Scott Chiasson is born in Norwich, CT. |
| Tuesday, August 16 |
| » Defeated Pirates (69-50), 6-5 | Wrigley Field (38-23) | 66-51 | |
| » W: Guillermo Hernandez (6-4) L: Larry Demery (5-4) | Third | 7 out |
| Former Cub Joe Kelly dies in St.Joseph, MO at the age of 91. |
| Wednesday, August 17 |
| » Defeated Pirates (69-51), 4-2 | Wrigley Field (39-23) | 67-51 | Won 2 |
| » W: Rick Reuschel (16-5) L: Jim Rooker (10-7) | Third | 6 out |
| Thursday, August 18 |
| » Lost to Pirates (70-51), 7-6 | Wrigley Field (39-24) | 67-52 | |
| » W: Jerry Reuss (9-11) L: Ray Burris (12-12) S: Kent Tekulve (5) | Third | 7 out |
| Friday, August 19 |
| » Defeated Dodgers (73-48), 6-2 | Wrigley Field (40-24) | 68-52 | |
| » W: Mike Krukow (8-10) L: Tommy John (14-5) | Third | 7 out |
| Saturday, August 20 |
| » Defeated Dodgers (73-49), 5-4 | Wrigley Field (41-24) | 69-52 | Won 2 |
| » W: Guillermo Hernandez (7-4) L: Charlie Hough (5-9) S: Dave Giusti (7) | Third | 7 out |
| Sunday, August 21 |
| » Lost to Dodgers (74-49), 5-1 | Wrigley Field (41-25) | 69-53 | |
| » W: Rick Rhoden (14-8) L: Dennis Lamp (0-1) S: Lance Rautzhan (1) | Third | 8 out |
| » Major-league debuts: Dennis Lamp (Cubs) |
| Monday, August 22 |
| » Defeated Giants (57-69), 3-2 | Wrigley Field (42-25) | 70-53 | |
| » W: Rick Reuschel (17-5) L: Jim Barr (11-11) S: Guillermo Hernandez (4) | Third | 8 out |
| Tuesday, August 23 |
| » Lost to Giants (58-69), 4-3 | Wrigley Field (42-26) | 70-54 | |
| » W: Charlie Williams (5-4) L: Paul Reuschel (4-5) | Third | 9 out |
| Wednesday, August 24 |
| » Lost to Braves (44-81), 4-3 | Atlanta-Fulton County Stadium (2-3) | 70-55 | Lost 2 |
| » W: Don Collins (3-9) L: Guillermo Hernandez (7-5) S: Dave Campbell (4) | Fourth | 9 out |
| Thursday, August 25 |
| » Lost to Braves (45-81), 8-6 | Atlanta-Fulton County Stadium (2-4) | 70-56 | Lost 3 |
| » W: Dick Ruthven (5-10) L: Bill Bonham (10-11) S: Mike Davey (1) | Fourth | 9 out |
| Friday, August 26 |
| » Defeated Giants (59-71), 5-2 | Candlestick Park (4-0) | 71-56 | |
| » W: Rick Reuschel (18-5) L: Jim Barr (11-12) S: Bruce Sutter (25) | Third | 8 out |
| Saturday, August 27 |
| » Lost to Giants (60-71), 7-1 | Candlestick Park (4-1) | 71-57 | |
| » W: Bob Knepper (7-7) L: Ray Burris (12-13) | Third | 8 out |
| Sunday, August 28 |
| » Lost to Giants (61-71), 4-1 | Candlestick Park (4-2) | 71-58 | Lost 2 |
| » W: Ed Halicki (12-10) L: Dave Roberts (4-11) | Third | 8 out |
| Monday, August 29 |
| » Lost to Dodgers (79-52), 4-1 | Dodger Stadium (1-3) | 71-59 | Lost 3 |
| » W: Tommy John (16-5) L: Mike Krukow (8-11) S: Mike Garman (9) | Third | 9 out |
| Tuesday, August 30 |
| » Defeated Dodgers (79-53), 4-1 | Dodger Stadium (2-3) | 72-59 | |
| » W: Rick Reuschel (19-5) L: Doug Rau (13-5) S: Bruce Sutter (26) | Third | 9 out |
| Wednesday, August 31 |
| » Lost to Dodgers (80-53), 5-0 | Dodger Stadium (2-4) | 72-60 | |
| » W: Rick Rhoden (16-8) L: Ray Burris (12-14) | Third | 10 out |
| Friday, September 2 |
| » Lost to Padres (60-76), 5-0 | San Diego/Jack Murphy Stadium (2-2) | 72-61 | Lost 2 |
| » W: Randy Jones (6-11) L: Mike Krukow (8-12) S: Rollie Fingers (31) | Third | 11 out |
| Saturday, September 3 |
| » Lost to Padres (61-76), 4-1 | San Diego/Jack Murphy Stadium (2-3) | 72-62 | Lost 3 |
| » W: Dan Spillner (6-3) L: Rick Reuschel (19-6) | Third | 12 out |
| Sunday, September 4 |
| » Defeated Padres (61-77), 2-1 | San Diego/Jack Murphy Stadium (3-3) | 73-62 | |
| » W: Ray Burris (13-14) L: Dan Spillner (6-4) S: Bruce Sutter (27) | Fourth | 11 out |
| Monday, September 5 |
| » Defeated Cardinals (73-64), 4-2 | Wrigley Field (43-26) | 74-62 | Won 2 |
| » W: Dave Roberts (5-11) L: Eric Rasmussen (10-14) | Third | 10½ out |
| Tuesday, September 6 |
| » Lost to Cardinals (74-64), 3-1 | Wrigley Field (43-27) | 74-63 | |
| » W: Tom Underwood (8-10) L: Guillermo Hernandez (7-6) | Third | 10½ out |
| Wednesday, September 7 |
| » Lost to Expos (63-75), 4-2 | Wrigley Field (43-28) | 74-64 | Lost 2 |
| » W: Stan Bahnsen (9-9) L: Rick Reuschel (19-7) S: Don Stanhouse (7) | Third | 11½ out |
| Thursday, September 8 |
| » Defeated Expos (63-76), 3-2 | Wrigley Field (44-28) | 75-64 | |
| » W: Bruce Sutter (6-1) L: Joe Kerrigan (2-5) | Third | 11½ out |
| Friday, September 9 |
| » Defeated Mets (54-87), 10-8 | Wrigley Field (45-28) | 76-64 | Won 2 |
| » W: Bruce Sutter (7-1) L: Bob Apodaca (3-7) | Third | 11½ out |
| Saturday, September 10 |
| » Lost to Mets (55-87), 7-2 | Wrigley Field (45-29) | 76-65 | |
| » W: Skip Lockwood (4-7) L: Donnie Moore (3-2) | Third | 12½ out |
| Future Cub Chad Hermansen is born in Salt Lake City, UT. |
| Sunday, September 11 |
| » Lost to Mets (56-87), 7-3 | Wrigley Field (45-30) | 76-66 | Lost 2 |
| » W: Bob Myrick (2-2) L: Rick Reuschel (19-8) S: Skip Lockwood (19) | Third | 13½ out |
| Monday, September 12 |
| » Lost to Cardinals (75-69), 11-9 | Busch Stadium II (2-6) | 76-67 | Lost 3 |
| » W: John Sutton (1-1) L: Bruce Sutter (7-2) | Third | 14½ out |
| Tuesday, September 13 |
| » Lost to Cardinals (76-69), 3-1 | Busch Stadium II (2-7) | 76-68 | Lost 4 |
| » W: Bob Forsch (17-6) L: Ray Burris (13-15) S: Pete Falcone (1) | Fourth | 14½ out |
| Wednesday, September 14 |
| » Lost to Expos (67-78), 3-2 | Stade Olympique (6-2) | 76-69 | Lost 5 |
| » W: Bill Atkinson (7-2) L: Dave Giusti (3-5) | Fourth | 14½ out |
| Thursday, September 15 |
| » Lost to Expos (68-78), 5-4 | Stade Olympique (6-3) | 76-70 | Lost 6 |
| » W: Will McEnaney (3-5) L: Bruce Sutter (7-3) | Fourth | 15½ out |
| Saturday, September 17 |
| » Lost to Mets (59-89), 5-4 | Shea Stadium (2-4) | 76-71 | Lost 7 |
| » W: Bob Apodaca (4-8) L: Paul Reuschel (4-6) | Third | 16 out |
| » Defeated Mets (59-90), 4-3 | Shea Stadium (3-4) | 77-71 | |
| » W: Guillermo Hernandez (8-6) L: Skip Lockwood (4-8) | Third | 16 out |
| Sunday, September 18 |
| » Defeated Mets (59-91), 6-3 | Shea Stadium (4-4) | 78-71 | Won 2 |
| » W: Rick Reuschel (20-8) L: Jackson Todd (3-5) S: Bruce Sutter (28) | Third | 15½ out |
| » Lost to Mets (60-91), 6-0 | Shea Stadium (4-5) | 78-72 | |
| » W: Craig Swan (9-9) L: Mike Krukow (8-13) S: Bob Myrick (1) | Third | 15½ out |
| Tuesday, September 20 |
| » Lost to Phillies (94-56), 4-2 | Veteran's Stadium (3-4) | 78-73 | Lost 2 |
| » W: Steve Carlton (22-9) L: Bill Bonham (10-12) | < |