| 1991-04-10 | vs LAN | 1 | L 4-6 | 0-1 | 4 | 18,527 | John Smoltz | Tim Belcher | Tim Belcher | John Smoltz | John Candelaria | 4 | 6 | -2 |
| 1991-04-11 | vs LAN | 2 | L 2-4 | 0-2 | 6 | 14,672 | Charlie Leibrandt | Ramon Martinez | Ramon Martinez | Charlie Leibrandt | | 6 | 10 | -4 |
| 1991-04-13 | @ CIN | 3 | W 7-5 | 1-2 | 6 | 18,566 | Steve Avery | Jack Armstrong | Steve Avery | Jack Armstrong | Juan Berenguer | 13 | 15 | -2 |
| 1991-04-14 | @ CIN | 4 | W 12-1 | 2-2 | 2 | 25,837 | Tom Glavine | Tom Browning | Tom Glavine | Tom Browning | | 25 | 16 | 9 |
| 1991-04-15 | vs HOU | 5 | L 1-3 | 2-3 | 4 | 6,729 | John Smoltz | Jim Deshaies | Al Osuna | Kent Mercker | Curt Schilling | 26 | 19 | 7 |
| 1991-04-16 | vs HOU | 6 | W 10-4 | 3-3 | 2 | 7,759 | Charlie Leibrandt | Pete Harnisch | Doug Sisk | Xavier Hernandez | | 36 | 23 | 13 |
| 1991-04-17 | vs HOU | 7 | L 3-4 | 3-4 | 5 | 8,342 | Steve Avery | Mark Portugal | Mark Portugal | Steve Avery | Curt Schilling | 39 | 27 | 12 |
| 1991-04-19 | vs CIN | 8 | L 3-8 | 3-5 | 6 | 13,498 | Tom Glavine | Jack Armstrong | Jack Armstrong | Tom Glavine | | 42 | 35 | 7 |
| 1991-04-20 | vs CIN | 9 | L 0-3 | 3-6 | 6 | 27,464 | John Smoltz | Tom Browning | Tom Browning | John Smoltz | | 42 | 38 | 4 |
| 1991-04-21 | vs CIN | 10 | W 3-2 | 4-6 | 6 | 23,473 | Charlie Leibrandt | Jose Rijo | Charlie Leibrandt | Jose Rijo | Kent Mercker | 45 | 40 | 5 |
| 1991-04-22 | @ LAN | 11 | W 7-1 | 5-6 | 6 | 42,723 | Steve Avery | Bob Ojeda | Steve Avery | Bob Ojeda | | 52 | 41 | 11 |
| 1991-04-23 | @ LAN | 12 | W 4-0 | 6-6 | 3 | 27,737 | Tom Glavine | Kevin Gross | Tom Glavine | Kevin Gross | | 56 | 41 | 15 |
| 1991-04-24 | @ LAN | 13 | L 4-8 | 6-7 | 6 | 42,023 | John Smoltz | Mike Morgan | Mike Morgan | John Smoltz | | 60 | 49 | 11 |
| 1991-04-26 | @ HOU | 14 | W 7-2 | 7-7 | 4 | 16,391 | Charlie Leibrandt | Jim Deshaies | Charlie Leibrandt | Jim Deshaies | | 67 | 51 | 16 |
| 1991-04-27 | @ HOU | 15 | W 2-1 | 8-7 | 2 | 17,527 | Steve Avery | Pete Harnisch | Doug Sisk | Jim Corsi | Jeff Parrett | 69 | 52 | 17 |
| 1991-04-28 | @ HOU | 16 | L 0-2 | 8-8 | 4 | 11,817 | Tom Glavine | Jimmy Jones | Jimmy Jones | Tom Glavine | Dwayne Henry | 69 | 54 | 15 |
| 1991-04-29 | @ SLN | 17 | L 3-4 | 8-9 | 4 | 19,010 | John Smoltz | Bob Tewksbury | Lee Smith | Doug Sisk | | 72 | 58 | 14 |
| 1991-04-30 | @ SLN | 18 | L 3-5 | 8-10 | 4 | 19,844 | Charlie Leibrandt | Jose DeLeon | Cris Carpenter | Charlie Leibrandt | Lee Smith | 75 | 63 | 12 |
| 1991-05-01 | @ SLN | 19 | W 5-4 | 9-10 | 4 | 27,043 | Steve Avery | Bryn Smith | Kent Mercker | Mike Perez | | 80 | 67 | 13 |
| 1991-05-03 | vs CHN | 20 | W 5-2 | 10-10 | 3 | 30,476 | Tom Glavine | Shawn Boskie | Tom Glavine | Shawn Boskie | Kent Mercker | 85 | 69 | 16 |
| 1991-05-04 | vs CHN | 21 | W 4-2 | 11-10 | 3 | 20,724 | John Smoltz | Rick Sutcliffe | John Smoltz | Rick Sutcliffe | Juan Berenguer | 89 | 71 | 18 |
| 1991-05-05 | vs CHN | 22 | L 6-9 | 11-11 | 3 | 27,141 | Charlie Leibrandt | Mike Bielecki | Chuck McElroy | Charlie Leibrandt | Dave Smith | 95 | 80 | 15 |
| 1991-05-07 | vs SLN | 23 | W 9-2 | 12-11 | 2 | 17,196 | Steve Avery | Bryn Smith | Steve Avery | Bryn Smith | | 104 | 82 | 22 |
| 1991-05-08 | vs SLN | 24 | W 17-1 | 13-11 | 2 | 9,699 | Tom Glavine | Ken Hill | Tom Glavine | Ken Hill | | 121 | 83 | 38 |
| 1991-05-10 | @ PIT | 25 | L 2-5 | 13-12 | 1 | 23,936 | John Smoltz | John Smiley | John Smiley | John Smoltz | Stan Belinda | 123 | 88 | 35 |
| 1991-05-11 | @ PIT | 26 | W 3-2 | 14-12 | 1 | 33,914 | Charlie Leibrandt | Doug Drabek | Charlie Leibrandt | Doug Drabek | Kent Mercker | 126 | 90 | 36 |
| 1991-05-12 | @ PIT | 27 | W 6-1 | 15-12 | 1 | 20,287 | Steve Avery | Vicente Palacios | Steve Avery | Vicente Palacios | Juan Berenguer | 132 | 91 | 41 |
| 1991-05-13 | @ CHN | 28 | W 5-3 | 16-12 | 1 | 29,579 | Tom Glavine | Shawn Boskie | Tom Glavine | Shawn Boskie | | 137 | 94 | 43 |
| 1991-05-14 | @ CHN | 29 | L 4-5 | 16-13 | 1 | 31,446 | John Smoltz | Bob Scanlan | Paul Assenmacher | Kent Mercker | Dave Smith | 141 | 99 | 42 |
| 1991-05-15 | @ CHN | 30 | L 1-6 | 16-14 | 2 | 25,814 | Charlie Leibrandt | Rick Sutcliffe | Paul Assenmacher | Juan Berenguer | | 142 | 105 | 37 |
| 1991-05-17 | vs PIT | 31 | W 9-3 | 17-14 | 1 | 32,824 | Steve Avery | Vicente Palacios | Steve Avery | Vicente Palacios | | 151 | 108 | 43 |
| 1991-05-19 | vs PIT | 32 | W 7-1 | 18-14 | 2 | 27,164 | Tom Glavine | Zane Smith | Tom Glavine | Zane Smith | Juan Berenguer | 158 | 109 | 49 |
| 1991-05-20 | vs SDN | 33 | L 3-7 | 18-15 | 2 | 7,800 | John Smoltz | Ed Whitson | Ed Whitson | John Smoltz | | 161 | 116 | 45 |
| 1991-05-21 | vs SDN | 34 | W 4-1 | 19-15 | 2 | 8,808 | Charlie Leibrandt | Rich Rodriguez | Kent Mercker | Steve Rosenberg | | 165 | 117 | 48 |
| 1991-05-22 | vs SDN | 35 | L 2-7 | 19-16 | 2 | 12,486 | Steve Avery | Bruce Hurst | Bruce Hurst | Steve Avery | | 167 | 124 | 43 |
| 1991-05-23 | vs SDN | 36 | L 10-11 | 19-17 | 2 | 13,780 | Pete Smith | Adam Peterson | Steve Rosenberg | Jeff Parrett | | 177 | 135 | 42 |
| 1991-05-24 | vs SFN | 37 | W 3-2 | 20-17 | 2 | 26,313 | Tom Glavine | John Burkett | Tom Glavine | Dave Righetti | | 180 | 137 | 43 |
| 1991-05-25 | vs SFN | 38 | L 6-7 | 20-18 | 2 | 37,306 | John Smoltz | Kelly Downs | Kelly Downs | John Smoltz | Jeff Brantley | 186 | 144 | 42 |
| 1991-05-26 | vs SFN | 39 | L 6-10 | 20-19 | 2 | 34,538 | Charlie Leibrandt | Buddy Black | Buddy Black | Charlie Leibrandt | | 192 | 154 | 38 |
| 1991-05-27 | @ SDN | 40 | W 3-1 | 21-19 | 2 | 21,342 | Steve Avery | Bruce Hurst | Steve Avery | Bruce Hurst | Juan Berenguer | 195 | 155 | 40 |
| 1991-05-28 | @ SDN | 41 | W 8-6 | 22-19 | 2 | 10,082 | Pete Smith | Adam Peterson | Mike Stanton | Craig Lefferts | Juan Berenguer | 203 | 161 | 42 |
| 1991-05-29 | @ SDN | 42 | W 5-1 | 23-19 | 2 | 13,038 | Tom Glavine | Andy Benes | Tom Glavine | Andy Benes | | 208 | 162 | 46 |
| 1991-05-30 | @ SFN | 43 | W 7-2 | 24-19 | 2 | 8,368 | John Smoltz | Kelly Downs | John Smoltz | Kelly Downs | | 215 | 164 | 51 |
| 1991-05-31 | @ SFN | 44 | W 5-2 | 25-19 | 2 | 14,102 | Charlie Leibrandt | Buddy Black | Charlie Leibrandt | Buddy Black | Mike Stanton | 220 | 166 | 54 |
| 1991-06-01 | @ SFN | 45 | L 2-8 | 25-20 | 2 | 26,357 | Steve Avery | Don Robinson | Don Robinson | Steve Avery | Francisco Oliveras | 222 | 174 | 48 |
| 1991-06-02 | @ SFN | 46 | L 1-2 | 25-21 | 2 | 25,162 | Pete Smith | Trevor Wilson | Trevor Wilson | Kent Mercker | Dave Righetti | 223 | 176 | 47 |
| 1991-06-04 | vs PHI | 47 | W 9-5 | 26-21 | 2 | 30,165 | Tom Glavine | Terry Mulholland | Tom Glavine | Terry Mulholland | | 232 | 181 | 51 |
| 1991-06-05 | vs PHI | 48 | L 11-12 | 26-22 | 2 | 16,937 | John Smoltz | Jason Grimsley | Darrel Akerfelds | Jeff Parrett | Jose De Jesus | 243 | 193 | 50 |
| 1991-06-06 | vs PHI | 49 | W 9-4 | 27-22 | 2 | 15,682 | Charlie Leibrandt | Pat Combs | Charlie Leibrandt | Pat Combs | | 252 | 197 | 55 |
| 1991-06-07 | vs MON | 50 | L 2-11 | 27-23 | 2 | 23,097 | Steve Avery | Oil Can Boyd | Oil Can Boyd | Steve Avery | | 254 | 208 | 46 |
| 1991-06-08 | vs MON | 51 | W 7-6 | 28-23 | 2 | 32,293 | Pete Smith | Brian Barnes | Mike Stanton | Tim Burke | Kent Mercker | 261 | 214 | 47 |
| 1991-06-09 | vs MON | 52 | W 8-6 | 29-23 | 2 | 23,171 | Tom Glavine | Mark Gardner | Tom Glavine | Mark Gardner | Juan Berenguer | 269 | 220 | 49 |
| 1991-06-10 | vs MON | 53 | L 1-7 | 29-24 | 2 | 19,853 | John Smoltz | Dennis Martinez | Dennis Martinez | John Smoltz | Scott Ruskin | 270 | 227 | 43 |
| 1991-06-11 | @ NYN | 54 | L 1-2 | 29-25 | 2 | 23,395 | Charlie Leibrandt | Frank Viola | Frank Viola | Charlie Leibrandt | John Franco | 271 | 229 | 42 |
| 1991-06-12 | @ NYN | 55 | W 6-1 | 30-25 | 2 | 20,815 | Steve Avery | Ron Darling | Steve Avery | Ron Darling | | 277 | 230 | 47 |
| 1991-06-13 | @ NYN | 56 | W 3-2 | 31-25 | 2 | 26,211 | Pete Smith | Wally Whitehurst | Pete Smith | Wally Whitehurst | Juan Berenguer | 280 | 232 | 48 |
| 1991-06-14 | @ MON | 57 | L 1-2 | 31-26 | 2 | 18,001 | Tom Glavine | Mark Gardner | Mark Gardner | Tom Glavine | Scott Ruskin | 281 | 234 | 47 |
| 1991-06-15 | @ MON | 58 | L 0-2 | 31-27 | 2 | 16,586 | John Smoltz | Dennis Martinez | Dennis Martinez | John Smoltz | | 281 | 236 | 45 |
| 1991-06-16 | @ MON | 59 | L 6-7 | 31-28 | 3 | 18,107 | Charlie Leibrandt | Chris Nabholz | Bill Sampen | Mike Stanton | Barry Jones | 287 | 243 | 44 |
| 1991-06-17 | @ PHI | 60 | L 3-4 | 31-29 | 3 | 18,517 | Steve Avery | Tommy Greene | Mitch Williams | Juan Berenguer | | 290 | 247 | 43 |
| 1991-06-18 | @ PHI | 61 | L 4-8 | 31-30 | 3 | 12,405 | Pete Smith | Jose De Jesus | Jose De Jesus | Pete Smith | | 294 | 255 | 39 |
| 1991-06-19 | @ PHI | 62 | W 9-2 | 32-30 | 3 | 23,989 | Tom Glavine | Terry Mulholland | Tom Glavine | Terry Mulholland | | 303 | 257 | 46 |
| 1991-06-20 | vs NYN | 63 | L 7-9 | 32-31 | 3 | 29,438 | John Smoltz | Dwight Gooden | Dwight Gooden | John Smoltz | Alejandro Pena | 310 | 266 | 44 |
| 1991-06-21 | vs NYN | 64 | W 4-2 | 33-31 | 3 | 43,229 | Charlie Leibrandt | Frank Viola | Charlie Leibrandt | Frank Viola | Juan Berenguer | 314 | 268 | 46 |
| 1991-06-22 | vs NYN | 65 | L 2-7 | 33-32 | 3 | 43,349 | Steve Avery | Ron Darling | Ron Darling | Steve Avery | | 316 | 275 | 41 |
| 1991-06-23 | vs NYN | 66 | W 4-3 | 34-32 | 3 | 27,561 | Pete Smith | Wally Whitehurst | Kent Mercker | Wally Whitehurst | Juan Berenguer | 320 | 278 | 42 |
| 1991-06-25 | @ HOU | 67 | L 0-1 | 34-33 | 4 | 22,617 | Tom Glavine | Pete Harnisch | Pete Harnisch | Tom Glavine | | 320 | 279 | 41 |
| 1991-06-26 | @ HOU | 68 | W 3-2 | 35-33 | 3 | 23,589 | John Smoltz | Jimmy Jones | Mike Stanton | Jim Clancy | Juan Berenguer | 323 | 281 | 42 |
| 1991-06-27 | @ HOU | 69 | W 3-0 | 36-33 | 3 | 30,145 | Charlie Leibrandt | Mark Portugal | Charlie Leibrandt | Mark Portugal | | 326 | 281 | 45 |
| 1991-06-28 | vs LAN | 70 | W 3-2 | 37-34 | 3 | 0 | Steve Avery | Bob Ojeda | Kent Mercker | Jim Gott | | 329 | 283 | 46 |
| 1991-06-28 | vs LAN | 71 | L 2-8 | 37-34 | 3 | 43,339 | Pete Smith | Mike Morgan | Mike Morgan | Rick Mahler | | 331 | 291 | 40 |
| 1991-06-29 | vs LAN | 72 | L 1-2 | 37-35 | 3 | 43,319 | Tom Glavine | Tim Belcher | Mike Hartley | Juan Berenguer | Kevin Gross | 332 | 293 | 39 |
| 1991-06-30 | vs LAN | 73 | L 4-11 | 37-36 | 3 | 30,850 | John Smoltz | Orel Hershiser | Orel Hershiser | John Smoltz | Kevin Gross | 336 | 304 | 32 |
| 1991-07-02 | vs CIN | 74 | L 3-6 | 37-37 | 3 | 22,056 | Charlie Leibrandt | Jack Armstrong | Jack Armstrong | Charlie Leibrandt | | 339 | 310 | 29 |
| 1991-07-03 | vs CIN | 75 | W 8-6 | 38-37 | 3 | 20,279 | Steve Avery | Tom Browning | Steve Avery | Tim Layana | Juan Berenguer | 347 | 316 | 31 |
| 1991-07-04 | vs CIN | 76 | L 4-10 | 38-38 | 3 | 42,153 | Pete Smith | Kip Gross | Kip Gross | Pete Smith | | 351 | 326 | 25 |
| 1991-07-05 | @ LAN | 77 | W 4-1 | 39-38 | 3 | 49,199 | Tom Glavine | Tim Belcher | Tom Glavine | Tim Belcher | | 355 | 327 | 28 |
| 1991-07-06 | @ LAN | 78 | L 6-7 | 39-39 | 3 | 47,207 | John Smoltz | Orel Hershiser | Orel Hershiser | John Smoltz | Kevin Gross | 361 | 334 | 27 |
| 1991-07-07 | @ LAN | 79 | L 3-5 | 39-40 | 3 | 41,965 | Charlie Leibrandt | Ramon Martinez | Ramon Martinez | Charlie Leibrandt | Mike Morgan | 364 | 339 | 25 |
| 1991-07-11 | vs SLN | 80 | W 4-1 | 40-40 | 3 | 17,060 | Steve Avery | Jose DeLeon | Steve Avery | Jose DeLeon | Juan Berenguer | 368 | 340 | 28 |
| 1991-07-12 | vs SLN | 81 | W 6-2 | 41-40 | 3 | 28,114 | John Smoltz | Bryn Smith | John Smoltz | Bryn Smith | | 374 | 342 | 32 |
| 1991-07-13 | vs SLN | 82 | W 10-5 | 42-40 | 3 | 43,424 | Charlie Leibrandt | Ken Hill | Charlie Leibrandt | Ken Hill | | 384 | 347 | 37 |
| 1991-07-14 | vs SLN | 83 | W 2-1 | 43-40 | 3 | 22,684 | Tom Glavine | Bob Tewksbury | Tom Glavine | Bob Tewksbury | | 386 | 348 | 38 |
| 1991-07-15 | vs CHN | 84 | L 4-6 | 43-41 | 3 | 25,057 | Pete Smith | Greg Maddux | Greg Maddux | Pete Smith | Paul Assenmacher | 390 | 354 | 36 |
| 1991-07-16 | vs CHN | 85 | W 8-5 | 44-41 | 2 | 25,893 | Steve Avery | Frank Castillo | Marvin Freeman | Bob Scanlan | Juan Berenguer | 398 | 359 | 39 |
| 1991-07-17 | vs CHN | 86 | W 12-2 | 45-41 | 2 | 16,984 | John Smoltz | Les Lancaster | John Smoltz | Les Lancaster | | 410 | 361 | 49 |
| 1991-07-19 | @ SLN | 87 | W 8-3 | 46-41 | 2 | 35,259 | Charlie Leibrandt | Ken Hill | Charlie Leibrandt | Ken Hill | Juan Berenguer | 418 | 364 | 54 |
| 1991-07-20 | @ SLN | 88 | L 1-2 | 46-42 | 2 | 39,383 | Tom Glavine | Bob Tewksbury | Lee Smith | Mike Stanton | | 419 | 366 | 53 |
| 1991-07-21 | @ SLN | 89 | W 5-1 | 47-42 | 2 | 32,274 | Steve Avery | Omar Olivares | Steve Avery | Omar Olivares | | 424 | 367 | 57 |
| 1991-07-22 | @ PIT | 90 | W 7-3 | 48-42 | 2 | 20,549 | John Smoltz | Zane Smith | John Smoltz | Zane Smith | | 431 | 370 | 61 |
| 1991-07-23 | @ PIT | 91 | L 3-12 | 48-43 | 2 | 21,664 | Charlie Leibrandt | Doug Drabek | Doug Drabek | Charlie Leibrandt | | 434 | 382 | 52 |
| 1991-07-24 | @ PIT | 92 | L 4-7 | 48-44 | 2 | 26,508 | Tom Glavine | John Smiley | John Smiley | Tom Glavine | Stan Belinda | 438 | 389 | 49 |
| 1991-07-26 | @ CHN | 93 | W 6-2 | 49-44 | 2 | 35,604 | Steve Avery | Frank Castillo | Steve Avery | Frank Castillo | | 444 | 391 | 53 |
| 1991-07-27 | @ CHN | 94 | L 5-7 | 49-45 | 2 | 34,023 | John Smoltz | Les Lancaster | Les Lancaster | John Smoltz | Chuck McElroy | 449 | 398 | 51 |
| 1991-07-28 | @ CHN | 95 | L 2-6 | 49-46 | 2 | 33,782 | Charlie Leibrandt | Mike Bielecki | Mike Bielecki | Charlie Leibrandt | Paul Assenmacher | 451 | 404 | 47 |
| 1991-07-29 | vs PIT | 96 | W 7-5 | 51-46 | 2 | 0 | Tom Glavine | Doug Drabek | Tom Glavine | Doug Drabek | Marvin Freeman | 458 | 409 | 49 |
| 1991-07-29 | vs PIT | 97 | W 5-3 | 51-46 | 2 | 32,292 | Rick Mahler | John Smiley | Rick Mahler | John Smiley | Kent Mercker | 463 | 412 | 51 |
| 1991-07-30 | vs PIT | 98 | W 10-3 | 52-46 | 2 | 27,099 | Steve Avery | Paul Miller | Jeff Parrett | Bill Landrum | Kent Mercker | 473 | 415 | 58 |
| 1991-07-31 | vs PIT | 99 | W 8-6 | 53-46 | 2 | 23,955 | John Smoltz | Rick Reed | John Smoltz | Vicente Palacios | Mike Stanton | 481 | 421 | 60 |
| 1991-08-02 | vs SDN | 100 | L 3-13 | 53-47 | 2 | 34,466 | Charlie Leibrandt | Bruce Hurst | Bruce Hurst | Charlie Leibrandt | | 484 | 434 | 50 |
| 1991-08-03 | vs SDN | 101 | L 2-3 | 53-48 | 2 | 42,067 | Tom Glavine | Andy Benes | Andy Benes | Tom Glavine | Larry Andersen | 486 | 437 | 49 |
| 1991-08-04 | vs SDN | 102 | W 9-7 | 54-48 | 2 | 25,006 | Steve Avery | Dennis Rasmussen | Steve Avery | Dennis Rasmussen | Juan Berenguer | 495 | 444 | 51 |
| 1991-08-05 | vs SFN | 103 | W 5-2 | 55-48 | 2 | 24,934 | John Smoltz | Don Robinson | John Smoltz | Don Robinson | | 500 | 446 | 54 |
| 1991-08-06 | vs SFN | 104 | W 10-6 | 56-48 | 2 | 27,231 | Rick Mahler | Paul McClellan | Jim Clancy | Paul McClellan | | 510 | 452 | 58 |
| 1991-08-07 | vs SFN | 105 | L 0-1 | 56-49 | 2 | 24,428 | Charlie Leibrandt | Buddy Black | Buddy Black | Charlie Leibrandt | Dave Righetti | 510 | 453 | 57 |
| 1991-08-08 | vs SFN | 106 | L 1-8 | 56-50 | 2 | 29,428 | Tom Glavine | John Burkett | John Burkett | Tom Glavine | | 511 | 461 | 50 |
| 1991-08-09 | vs HOU | 107 | W 7-2 | 57-50 | 2 | 34,700 | Steve Avery | Jim Deshaies | Steve Avery | Jim Deshaies | | 518 | 463 | 55 |
| 1991-08-10 | vs HOU | 108 | W 4-0 | 58-50 | 2 | 41,251 | John Smoltz | Pete Harnisch | John Smoltz | Pete Harnisch | | 522 | 463 | 59 |
| 1991-08-11 | vs HOU | 109 | W 3-1 | 59-50 | 2 | 23,646 | Armando Reynoso | Darryl Kile | Armando Reynoso | Darryl Kile | Mike Stanton | 525 | 464 | 61 |
| 1991-08-12 | @ SFN | 110 | W 2-1 | 60-50 | 2 | 22,339 | Charlie Leibrandt | Buddy Black | Charlie Leibrandt | Buddy Black | Juan Berenguer | 527 | 465 | 62 |
| 1991-08-13 | @ SFN | 111 | W 9-2 | 61-50 | 2 | 17,298 | Tom Glavine | John Burkett | Tom Glavine | John Burkett | | 536 | 467 | 69 |
| 1991-08-14 | @ SFN | 112 | L 3-8 | 61-51 | 2 | 32,284 | Steve Avery | Trevor Wilson | Trevor Wilson | Steve Avery | | 539 | 475 | 64 |
| 1991-08-15 | @ SDN | 113 | L 0-1 | 61-52 | 2 | 17,434 | John Smoltz | Greg Harris | Greg Harris | John Smoltz | | 539 | 476 | 63 |
| 1991-08-16 | @ SDN | 114 | W 3-2 | 62-52 | 2 | 19,049 | Armando Reynoso | Ricky Bones | Armando Reynoso | Ricky Bones | Mike Stanton | 542 | 478 | 64 |
| 1991-08-17 | @ SDN | 115 | W 2-1 | 63-52 | 2 | 39,551 | Charlie Leibrandt | Bruce Hurst | Charlie Leibrandt | Bruce Hurst | Mark Wohlers | 544 | 479 | 65 |
| 1991-08-18 | @ SDN | 116 | L 1-2 | 63-53 | 2 | 15,066 | Tom Glavine | Andy Benes | Andy Benes | Tom Glavine | Larry Andersen | 545 | 481 | 64 |
| 1991-08-20 | @ CIN | 117 | L 2-8 | 64-54 | 2 | 0 | Steve Avery | Jose Rijo | Jose Rijo | Steve Avery | | 547 | 489 | 58 |
| 1991-08-20 | @ CIN | 118 | W 5-1 | 64-54 | 2 | 32,910 | John Smoltz | Mo Sanford | John Smoltz | Mo Sanford | | 552 | 490 | 62 |
| 1991-08-21 | @ CIN | 119 | W 10-9 | 65-54 | 2 | 30,005 | Armando Reynoso | Kip Gross | Tony Castillo | Randy Myers | | 562 | 499 | 63 |
| 1991-08-22 | @ CIN | 120 | W 4-1 | 66-54 | 2 | 26,011 | Charlie Leibrandt | Scott Scudder | Charlie Leibrandt | Scott Scudder | Jim Clancy | 566 | 500 | 66 |
| 1991-08-23 | vs PHI | 121 | W 4-2 | 67-54 | 2 | 43,161 | Tom Glavine | Terry Mulholland | Tom Glavine | Terry Mulholland | Mark Wohlers | 570 | 502 | 68 |
| 1991-08-24 | vs PHI | 122 | L 5-6 | 67-55 | 2 | 43,966 | John Smoltz | Danny Cox | Mitch Williams | Tony Castillo | | 575 | 508 | 67 |
| 1991-08-25 | vs PHI | 123 | L 5-6 | 67-56 | 2 | 26,027 | Steve Avery | Tommy Greene | Tommy Greene | Steve Avery | Mitch Williams | 580 | 514 | 66 |
| 1991-08-26 | vs MON | 124 | W 14-9 | 68-56 | 2 | 12,889 | Armando Reynoso | Chris Haney | Mark Wohlers | Bill Sampen | Mike Stanton | 594 | 523 | 71 |
| 1991-08-27 | vs MON | 125 | W 3-2 | 69-56 | 1 | 15,806 | Charlie Leibrandt | Chris Nabholz | Charlie Leibrandt | Chris Nabholz | Jim Clancy | 597 | 525 | 72 |
| 1991-08-28 | vs NYN | 126 | W 3-1 | 70-56 | 1 | 25,060 | Tom Glavine | Frank Viola | Tom Glavine | Frank Viola | | 600 | 526 | 74 |
| 1991-08-29 | vs NYN | 127 | W 2-0 | 71-56 | 1 | 27,435 | John Smoltz | Anthony Young | John Smoltz | Anthony Young | Mike Stanton | 602 | 526 | 76 |
| 1991-08-30 | @ PHI | 128 | W 6-1 | 72-56 | 1 | 22,708 | Steve Avery | Tommy Greene | Steve Avery | Tommy Greene | | 608 | 527 | 81 |
| 1991-08-31 | @ PHI | 129 | L 0-5 | 72-57 | 1 | 30,259 | Armando Reynoso | Jose De Jesus | Jose De Jesus | Armando Reynoso | | 608 | 532 | 76 |
| 1991-09-01 | @ PHI | 130 | L 4-5 | 72-58 | 1 | 25,141 | Charlie Leibrandt | Bruce Ruffin | Mitch Williams | Mark Wohlers | | 612 | 537 | 75 |
| 1991-09-02 | @ MON | 131 | L 3-4 | 72-59 | 1 | 16,124 | Tom Glavine | Bill Sampen | Bill Sampen | Tom Glavine | | 615 | 541 | 74 |
| 1991-09-03 | @ MON | 132 | W 4-1 | 73-59 | 1 | 7,833 | John Smoltz | Brian Barnes | John Smoltz | Brian Barnes | Alejandro Pena | 619 | 542 | 77 |
| 1991-09-04 | @ MON | 133 | L 4-8 | 73-60 | 2 | 6,752 | Steve Avery | Mark Gardner | Mel Rojas | Jim Clancy | | 623 | 550 | 73 |
| 1991-09-06 | @ NYN | 134 | W 4-2 | 74-60 | 2 | 21,960 | Kent Mercker | Wally Whitehurst | Alejandro Pena | Wally Whitehurst | Mike Stanton | 627 | 552 | 75 |
| 1991-09-07 | @ NYN | 135 | W 6-1 | 75-60 | 2 | 25,772 | Charlie Leibrandt | Frank Viola | Charlie Leibrandt | Frank Viola | | 633 | 553 | 80 |
| 1991-09-08 | @ NYN | 136 | W 7-5 | 76-60 | 2 | 22,449 | Tom Glavine | Anthony Young | Tom Glavine | John Franco | Alejandro Pena | 640 | 558 | 82 |
| 1991-09-09 | vs SFN | 137 | W 8-3 | 77-60 | 2 | 19,686 | John Smoltz | Buddy Black | John Smoltz | Buddy Black | Jim Clancy | 648 | 561 | 87 |
| 1991-09-10 | vs SFN | 138 | W 4-1 | 78-60 | 1 | 23,741 | Steve Avery | John Burkett | Steve Avery | John Burkett | Alejandro Pena | 652 | 562 | 90 |
| 1991-09-11 | vs SDN | 139 | W 1-0 | 79-60 | 1 | 20,477 | Kent Mercker | Greg Harris | Kent Mercker | Greg Harris | Alejandro Pena | 653 | 562 | 91 |
| 1991-09-12 | vs SDN | 140 | W 5-1 | 80-60 | 1 | 27,794 | Charlie Leibrandt | Bruce Hurst | Charlie Leibrandt | Bruce Hurst | | 658 | 563 | 95 |
| 1991-09-13 | vs LAN | 141 | L 2-5 | 80-61 | 2 | 45,769 | Tom Glavine | Mike Morgan | Mike Morgan | Tom Glavine | Roger McDowell | 660 | 568 | 92 |
| 1991-09-14 | vs LAN | 142 | W 3-2 | 81-61 | 1 | 44,773 | John Smoltz | Tim Belcher | Jim Clancy | Roger McDowell | | 663 | 570 | 93 |
| 1991-09-15 | vs LAN | 143 | W 9-1 | 82-61 | 1 | 45,541 | Steve Avery | Ramon Martinez | Steve Avery | Ramon Martinez | | 672 | 571 | 101 |
| 1991-09-16 | @ SFN | 144 | L 5-8 | 82-62 | 1 | 14,701 | Kent Mercker | Bryan Hickerson | Francisco Oliveras | Jim Clancy | Rod Beck | 677 | 579 | 98 |
| 1991-09-17 | @ SFN | 145 | L 2-3 | 82-63 | 2 | 8,481 | Charlie Leibrandt | Buddy Black | Buddy Black | Mike Stanton | Dave Righetti | 679 | 582 | 97 |
| 1991-09-18 | @ SDN | 146 | W 6-4 | 83-63 | 2 | 10,551 | Tom Glavine | Ricky Bones | Tom Glavine | Ricky Bones | Alejandro Pena | 685 | 586 | 99 |
| 1991-09-19 | @ SDN | 147 | W 4-2 | 84-63 | 2 | 13,556 | John Smoltz | Andy Benes | Mark Wohlers | Craig Lefferts | Alejandro Pena | 689 | 588 | 101 |
| 1991-09-20 | @ LAN | 148 | W 3-0 | 85-63 | 1 | 51,067 | Steve Avery | Tim Belcher | Steve Avery | Tim Belcher | | 692 | 588 | 104 |
| 1991-09-21 | @ LAN | 149 | L 1-2 | 85-64 | 2 | 48,051 | Charlie Leibrandt | Orel Hershiser | Roger McDowell | Mike Stanton | | 693 | 590 | 103 |
| 1991-09-22 | @ LAN | 150 | L 0-3 | 85-65 | 2 | 49,105 | Tom Glavine | Ramon Martinez | Ramon Martinez | Tom Glavine | Roger McDowell | 693 | 593 | 100 |
| 1991-09-25 | vs CIN | 151 | W 2-1 | 86-66 | 2 | 0 | John Smoltz | Jack Armstrong | Alejandro Pena | Ted Power | | 695 | 594 | 101 |
| 1991-09-25 | vs CIN | 152 | L 9-10 | 86-66 | 2 | 38,879 | Steve Avery | Randy Myers | Milt Hill | Mike Stanton | Rob Dibble | 704 | 604 | 100 |
| 1991-09-26 | vs CIN | 153 | L 0-8 | 86-67 | 2 | 42,431 | Charlie Leibrandt | Jose Rijo | Jose Rijo | Charlie Leibrandt | | 704 | 612 | 92 |
| 1991-09-27 | @ HOU | 154 | W 4-2 | 87-67 | 2 | 10,701 | Tom Glavine | Ryan Bowen | Mark Wohlers | Rob Mallicoat | Alejandro Pena | 708 | 614 | 94 |
| 1991-09-28 | @ HOU | 155 | W 5-4 | 88-67 | 2 | 8,647 | Kent Mercker | Jeff Juden | Mike Stanton | Xavier Hernandez | Alejandro Pena | 713 | 618 | 95 |
| 1991-09-29 | @ HOU | 156 | W 6-5 | 89-67 | 2 | 13,767 | Steve Avery | Pete Harnisch | Jim Clancy | Mark Portugal | | 719 | 623 | 96 |
| 1991-09-30 | @ CIN | 157 | W 4-0 | 90-67 | 2 | 14,338 | John Smoltz | Jack Armstrong | John Smoltz | Jack Armstrong | | 723 | 623 | 100 |
| 1991-10-01 | @ CIN | 158 | W 7-6 | 91-67 | 2 | 18,105 | Charlie Leibrandt | Jose Rijo | Mike Stanton | Rob Dibble | Alejandro Pena | 730 | 629 | 101 |
| 1991-10-02 | @ CIN | 159 | W 6-3 | 92-67 | 1 | 16,192 | Tom Glavine | Scott Scudder | Tom Glavine | Scott Scudder | Alejandro Pena | 736 | 632 | 104 |
| 1991-10-04 | vs HOU | 160 | W 5-2 | 93-67 | 1 | 45,815 | Steve Avery | Jeff Juden | Steve Avery | Jeff Juden | Alejandro Pena | 741 | 634 | 107 |
| 1991-10-05 | vs HOU | 161 | W 5-2 | 94-67 | 1 | 44,994 | John Smoltz | Mark Portugal | John Smoltz | Mark Portugal | | 746 | 636 | 110 |
| 1991-10-06 | vs HOU | 162 | L 3-8 | 94-68 | 1 | 42,764 | Charlie Leibrandt | Pete Harnisch | Pete Harnisch | Charlie Leibrandt | | 749 | 644 | 105 |