| 1971-04-06 | @ SDN | 1 | W 4-0 | 1-0 | 2 | 34,554 | Juan Marichal | Tom Phoebus | Juan Marichal | Tom Phoebus | | 4 | 0 | 4 |
| 1971-04-07 | @ SDN | 2 | W 7-3 | 2-0 | 2 | 6,790 | Gaylord Perry | Clay Kirby | Gaylord Perry | Clay Kirby | | 11 | 3 | 8 |
| 1971-04-08 | @ SDN | 3 | L 6-7 | 2-1 | 3 | 6,199 | Steve Stone | Steve Arlin | Gary Ross | Don McMahon | | 17 | 10 | 7 |
| 1971-04-10 | @ SLN | 4 | W 6-4 | 3-1 | 2 | 26,841 | Frank Reberger | Jerry Reuss | Frank Reberger | Jerry Reuss | Jerry Johnson | 23 | 14 | 9 |
| 1971-04-11 | @ SLN | 5 | L 2-4 | 4-2 | 3 | 0 | Rich Robertson | Bob Gibson | Bob Gibson | Rich Robertson | | 25 | 18 | 7 |
| 1971-04-11 | @ SLN | 6 | W 7-2 | 4-2 | 3 | 27,104 | Juan Marichal | Reggie Cleveland | Juan Marichal | Reggie Cleveland | | 32 | 20 | 12 |
| 1971-04-12 | vs SDN | 7 | W 5-0 | 5-2 | 1 | 29,847 | Gaylord Perry | Clay Kirby | Gaylord Perry | Clay Kirby | | 37 | 20 | 17 |
| 1971-04-14 | vs HOU | 8 | W 2-1 | 6-2 | 1 | 3,588 | Steve Stone | Tom Griffin | Don McMahon | George Culver | | 39 | 21 | 18 |
| 1971-04-15 | vs HOU | 9 | W 4-3 | 7-2 | 1 | 3,557 | Frank Reberger | Larry Dierker | Jerry Johnson | Jim Ray | | 43 | 24 | 19 |
| 1971-04-16 | vs CHN | 10 | W 9-0 | 8-2 | 1 | 8,133 | Juan Marichal | Fergie Jenkins | Juan Marichal | Fergie Jenkins | | 52 | 24 | 28 |
| 1971-04-17 | vs CHN | 11 | W 5-3 | 9-2 | 1 | 32,896 | Gaylord Perry | Ken Holtzman | Gaylord Perry | Ken Holtzman | | 57 | 27 | 30 |
| 1971-04-18 | vs CHN | 12 | W 5-1 | 11-2 | 1 | 0 | Steve Stone | Milt Pappas | John Cumberland | Milt Pappas | | 62 | 28 | 34 |
| 1971-04-18 | vs CHN | 13 | W 8-1 | 11-2 | 1 | 27,714 | Rich Robertson | Bill Bonham | Rich Robertson | Bill Bonham | | 70 | 29 | 41 |
| 1971-04-19 | vs SLN | 14 | W 4-2 | 12-2 | 1 | 3,630 | Frank Reberger | Jerry Reuss | Ron Bryant | Jerry Reuss | | 74 | 31 | 43 |
| 1971-04-20 | vs SLN | 15 | L 1-2 | 12-3 | 1 | 9,791 | Juan Marichal | Reggie Cleveland | Reggie Cleveland | Juan Marichal | Moe Drabowsky | 75 | 33 | 42 |
| 1971-04-21 | vs SLN | 16 | L 3-5 | 12-4 | 1 | 6,178 | Gaylord Perry | Bob Gibson | Bob Gibson | Gaylord Perry | | 78 | 38 | 40 |
| 1971-04-23 | @ PIT | 17 | W 2-0 | 13-4 | 1 | 12,350 | Steve Stone | Luke Walker | Steve Stone | Luke Walker | | 80 | 38 | 42 |
| 1971-04-24 | @ PIT | 18 | W 2-0 | 14-4 | 1 | 8,386 | Ron Bryant | Bob Johnson | Ron Bryant | Bob Johnson | | 82 | 38 | 44 |
| 1971-04-25 | @ PIT | 19 | L 2-6 | 14-5 | 1 | 16,553 | Juan Marichal | Nelson Briles | Nelson Briles | Juan Marichal | Dave Giusti | 84 | 44 | 40 |
| 1971-04-27 | @ ATL | 20 | W 6-5 | 15-5 | 1 | 13,494 | Gaylord Perry | Ron Reed | John Cumberland | Bob Priddy | Jerry Johnson | 90 | 49 | 41 |
| 1971-04-28 | @ ATL | 21 | W 5-3 | 16-5 | 1 | 7,250 | Steve Stone | Jim Nash | Steve Stone | Jim Nash | Don McMahon | 95 | 52 | 43 |
| 1971-04-29 | @ ATL | 22 | W 5-2 | 17-5 | 1 | 6,194 | Ron Bryant | Pat Jarvis | Don McMahon | Cecil Upshaw | John Cumberland | 100 | 54 | 46 |
| 1971-04-30 | @ CIN | 23 | W 7-5 | 18-5 | 1 | 21,689 | Juan Marichal | Jim Merritt | Jerry Johnson | Jim Merritt | Rich Robertson | 107 | 59 | 48 |
| 1971-05-01 | @ CIN | 24 | L 2-3 | 18-6 | 1 | 17,465 | Rich Robertson | Don Gullett | Don Gullett | Rich Robertson | Wayne Granger | 109 | 62 | 47 |
| 1971-05-02 | @ CIN | 25 | W 4-3 | 19-6 | 1 | 41,869 | Gaylord Perry | Gary Nolan | Jerry Johnson | Tony Cloninger | | 113 | 65 | 48 |
| 1971-05-04 | vs PIT | 26 | L 2-10 | 19-7 | 1 | 8,263 | Steve Stone | Steve Blass | Bob Moose | Steve Stone | Mudcat Grant | 115 | 75 | 40 |
| 1971-05-05 | vs PIT | 27 | W 2-1 | 20-7 | 1 | 5,212 | Juan Marichal | Luke Walker | Juan Marichal | Luke Walker | | 117 | 76 | 41 |
| 1971-05-07 | vs ATL | 28 | W 4-3 | 21-7 | 1 | 11,097 | Gaylord Perry | George Stone | Jerry Johnson | George Stone | | 121 | 79 | 42 |
| 1971-05-08 | vs ATL | 29 | L 2-5 | 21-8 | 1 | 10,751 | Ron Bryant | Ron Reed | Ron Reed | Ron Bryant | Cecil Upshaw | 123 | 84 | 39 |
| 1971-05-09 | vs ATL | 30 | W 5-2 | 22-9 | 1 | 0 | Steve Stone | Pat Jarvis | Steve Stone | Pat Jarvis | Don McMahon | 128 | 86 | 42 |
| 1971-05-09 | vs ATL | 31 | L 5-6 | 22-9 | 1 | 28,744 | Rich Robertson | Phil Niekro | Bob Priddy | Jerry Johnson | Cecil Upshaw | 133 | 92 | 41 |
| 1971-05-10 | vs CIN | 32 | W 3-2 | 23-9 | 1 | 4,768 | Juan Marichal | Wayne Simpson | Juan Marichal | Wayne Simpson | | 136 | 94 | 42 |
| 1971-05-11 | vs CIN | 33 | W 6-1 | 24-9 | 1 | 8,039 | Gaylord Perry | Jim Merritt | Gaylord Perry | Jim Merritt | | 142 | 95 | 47 |
| 1971-05-12 | vs CIN | 34 | W 7-2 | 25-9 | 1 | 5,120 | Ron Bryant | Don Gullett | Ron Bryant | Don Gullett | | 149 | 97 | 52 |
| 1971-05-14 | vs LAN | 35 | W 8-4 | 26-9 | 1 | 30,862 | Steve Stone | Al Downing | Jerry Johnson | Pete Mikkelsen | | 157 | 101 | 56 |
| 1971-05-15 | vs LAN | 36 | W 1-0 | 27-9 | 1 | 33,370 | Juan Marichal | Bill Singer | Juan Marichal | Bill Singer | | 158 | 101 | 57 |
| 1971-05-16 | vs LAN | 37 | L 6-9 | 27-10 | 1 | 33,981 | Gaylord Perry | Claude Osteen | Jim Brewer | Don McMahon | Joe Moeller | 164 | 110 | 54 |
| 1971-05-18 | @ CHN | 38 | W 7-3 | 28-10 | 1 | 12,600 | Ron Bryant | Milt Pappas | Ron Bryant | Milt Pappas | Jerry Johnson | 171 | 113 | 58 |
| 1971-05-19 | @ CHN | 39 | L 5-9 | 28-11 | 1 | 10,643 | Steve Stone | Fergie Jenkins | Fergie Jenkins | Steve Stone | | 176 | 122 | 54 |
| 1971-05-20 | @ CHN | 40 | W 8-7 | 29-11 | 1 | 16,027 | Juan Marichal | Ken Holtzman | Don McMahon | Ron Tompkins | | 184 | 129 | 55 |
| 1971-05-21 | @ HOU | 41 | L 1-4 | 29-12 | 1 | 18,555 | Gaylord Perry | Larry Dierker | Larry Dierker | Gaylord Perry | Fred Gladding | 185 | 133 | 52 |
| 1971-05-22 | @ HOU | 42 | L 1-2 | 29-13 | 1 | 25,893 | Rich Robertson | Don Wilson | George Culver | Don McMahon | | 186 | 135 | 51 |
| 1971-05-23 | @ HOU | 43 | W 7-4 | 30-13 | 1 | 23,692 | Ron Bryant | Tom Griffin | Ron Bryant | Tom Griffin | Jerry Johnson | 193 | 139 | 54 |
| 1971-05-25 | @ LAN | 44 | W 9-1 | 31-13 | 1 | 40,042 | Juan Marichal | Bill Singer | Juan Marichal | Bill Singer | | 202 | 140 | 62 |
| 1971-05-26 | @ LAN | 45 | W 6-4 | 32-13 | 1 | 27,541 | Gaylord Perry | Claude Osteen | Gaylord Perry | Joe Moeller | John Cumberland | 208 | 144 | 64 |
| 1971-05-27 | @ LAN | 46 | L 1-5 | 32-14 | 1 | 24,723 | Ron Bryant | Don Sutton | Don Sutton | Ron Bryant | | 209 | 149 | 60 |
| 1971-05-28 | vs MON | 47 | W 3-1 | 33-14 | 1 | 5,960 | Steve Stone | Steve Renko | Steve Stone | Steve Renko | Jerry Johnson | 212 | 150 | 62 |
| 1971-05-29 | vs MON | 48 | W 8-3 | 34-14 | 1 | 8,039 | Juan Marichal | Carl Morton | Juan Marichal | Carl Morton | | 220 | 153 | 67 |
| 1971-05-30 | vs MON | 49 | W 5-4 | 36-14 | 1 | 0 | Gaylord Perry | Bill Stoneman | Gaylord Perry | Bill Stoneman | Jerry Johnson | 225 | 157 | 68 |
| 1971-05-30 | vs MON | 50 | W 8-7 | 36-14 | 1 | 20,393 | Rich Robertson | John Strohmayer | Steve Hamilton | Mike Marshall | | 233 | 164 | 69 |
| 1971-05-31 | vs NYN | 51 | W 2-1 | 37-14 | 1 | 26,087 | Ron Bryant | Jerry Koosman | Jerry Johnson | Jerry Koosman | | 235 | 165 | 70 |
| 1971-06-01 | vs NYN | 52 | L 4-5 | 37-15 | 1 | 11,287 | Steve Stone | Gary Gentry | Gary Gentry | Steve Stone | Tug McGraw | 239 | 170 | 69 |
| 1971-06-02 | vs NYN | 53 | L 2-5 | 37-16 | 1 | 11,132 | Juan Marichal | Jim McAndrew | Charlie Williams | Juan Marichal | | 241 | 175 | 66 |
| 1971-06-04 | vs PHI | 54 | L 3-5 | 37-17 | 1 | 9,403 | Gaylord Perry | Chris Short | Chris Short | Gaylord Perry | Jim Bunning | 244 | 180 | 64 |
| 1971-06-05 | vs PHI | 55 | L 3-5 | 37-18 | 1 | 10,945 | Ron Bryant | Ken Reynolds | Joe Hoerner | Jerry Johnson | | 247 | 185 | 62 |
| 1971-06-06 | vs PHI | 56 | L 0-1 | 38-19 | 1 | 0 | Steve Stone | Rick Wise | Rick Wise | Steve Stone | | 247 | 186 | 61 |
| 1971-06-06 | vs PHI | 57 | W 4-3 | 38-19 | 1 | 33,516 | Frank Reberger | Barry Lersch | Rich Robertson | Joe Hoerner | | 251 | 189 | 62 |
| 1971-06-08 | @ MON | 58 | L 3-10 | 38-20 | 1 | 13,861 | Juan Marichal | Bill Stoneman | Bill Stoneman | Juan Marichal | | 254 | 199 | 55 |
| 1971-06-09 | @ MON | 59 | L 0-4 | 38-21 | 1 | 20,011 | Gaylord Perry | Steve Renko | Steve Renko | Gaylord Perry | | 254 | 203 | 51 |
| 1971-06-10 | @ MON | 60 | L 1-3 | 38-22 | 1 | 16,582 | Ron Bryant | Carl Morton | Carl Morton | Ron Bryant | | 255 | 206 | 49 |
| 1971-06-11 | @ NYN | 61 | W 3-2 | 39-22 | 1 | 52,486 | Steve Stone | Charlie Williams | Don McMahon | Tug McGraw | | 258 | 208 | 50 |
| 1971-06-12 | @ NYN | 62 | W 5-1 | 40-22 | 1 | 48,918 | Frank Reberger | Ray Sadecki | Frank Reberger | Ray Sadecki | Don McMahon | 263 | 209 | 54 |
| 1971-06-13 | @ NYN | 63 | L 4-5 | 40-23 | 1 | 52,010 | Juan Marichal | Gary Gentry | Tug McGraw | Steve Hamilton | | 267 | 214 | 53 |
| 1971-06-14 | @ PHI | 64 | L 4-9 | 40-24 | 1 | 16,118 | Gaylord Perry | Rick Wise | Rick Wise | Gaylord Perry | | 271 | 223 | 48 |
| 1971-06-15 | @ PHI | 65 | W 6-0 | 41-24 | 1 | 21,588 | Ron Bryant | Barry Lersch | Ron Bryant | Barry Lersch | | 277 | 223 | 54 |
| 1971-06-16 | @ PHI | 66 | L 3-6 | 41-25 | 1 | 27,212 | Steve Stone | Jim Bunning | Jim Bunning | Steve Stone | Joe Hoerner | 280 | 229 | 51 |
| 1971-06-18 | vs SDN | 67 | W 7-3 | 43-25 | 1 | 0 | Juan Marichal | Steve Arlin | Juan Marichal | Steve Arlin | | 287 | 232 | 55 |
| 1971-06-18 | vs SDN | 68 | W 10-9 | 43-25 | 1 | 14,513 | Frank Reberger | Tom Phoebus | Jerry Johnson | Danny Coombs | | 297 | 241 | 56 |
| 1971-06-19 | vs SDN | 69 | W 7-4 | 44-25 | 1 | 9,255 | Gaylord Perry | Clay Kirby | Jerry Johnson | Bob Miller | | 304 | 245 | 59 |
| 1971-06-20 | vs SDN | 70 | W 6-2 | 46-25 | 1 | 0 | Ron Bryant | Fred Norman | Don McMahon | Fred Norman | Jerry Johnson | 310 | 247 | 63 |
| 1971-06-20 | vs SDN | 71 | W 2-0 | 46-25 | 1 | 21,891 | Steve Stone | Dave Roberts | Steve Stone | Dave Roberts | | 312 | 247 | 65 |
| 1971-06-22 | vs CHN | 72 | W 2-0 | 47-25 | 1 | 12,526 | John Cumberland | Fergie Jenkins | John Cumberland | Fergie Jenkins | Jerry Johnson | 314 | 247 | 67 |
| 1971-06-23 | vs CHN | 73 | W 5-2 | 48-25 | 1 | 12,418 | Juan Marichal | Milt Pappas | Juan Marichal | Milt Pappas | | 319 | 249 | 70 |
| 1971-06-25 | @ HOU | 74 | L 4-5 | 48-26 | 1 | 24,713 | Gaylord Perry | Jack Billingham | Jim Ray | Gaylord Perry | | 323 | 254 | 69 |
| 1971-06-26 | @ HOU | 75 | W 3-1 | 49-26 | 1 | 32,025 | Ron Bryant | Larry Dierker | Ron Bryant | Larry Dierker | Steve Hamilton | 326 | 255 | 71 |
| 1971-06-27 | @ HOU | 76 | L 2-5 | 49-27 | 1 | 24,908 | Steve Stone | Ken Forsch | Ken Forsch | Steve Stone | | 328 | 260 | 68 |
| 1971-06-28 | @ SDN | 77 | L 2-6 | 49-28 | 1 | 9,763 | Juan Marichal | Clay Kirby | Clay Kirby | Juan Marichal | | 330 | 266 | 64 |
| 1971-06-29 | @ SDN | 78 | W 6-4 | 50-28 | 1 | 9,595 | John Cumberland | Dave Roberts | Don Carrithers | Dave Roberts | | 336 | 270 | 66 |
| 1971-06-30 | @ SDN | 79 | L 1-2 | 50-29 | 1 | 7,335 | Gaylord Perry | Steve Arlin | Steve Arlin | Gaylord Perry | | 337 | 272 | 65 |
| 1971-07-01 | vs SLN | 80 | W 8-7 | 51-29 | 1 | 7,794 | Ron Bryant | Al Santorini | Don McMahon | Chris Zachary | Jerry Johnson | 345 | 279 | 66 |
| 1971-07-02 | vs SLN | 81 | L 2-7 | 51-30 | 1 | 11,268 | Steve Stone | Bob Gibson | Bob Gibson | Steve Stone | | 347 | 286 | 61 |
| 1971-07-03 | vs SLN | 82 | W 10-1 | 52-30 | 1 | 24,896 | John Cumberland | Steve Carlton | John Cumberland | Steve Carlton | | 357 | 287 | 70 |
| 1971-07-04 | vs LAN | 83 | L 4-14 | 52-31 | 1 | 30,663 | Juan Marichal | Claude Osteen | Pete Mikkelsen | Jerry Johnson | | 361 | 301 | 60 |
| 1971-07-05 | vs LAN | 84 | L 3-7 | 52-32 | 1 | 29,518 | Gaylord Perry | Don Sutton | Don Sutton | Gaylord Perry | Jim Brewer | 364 | 308 | 56 |
| 1971-07-06 | vs HOU | 85 | L 2-5 | 52-33 | 1 | 5,765 | Ron Bryant | Jack Billingham | Jack Billingham | Ron Bryant | George Culver | 366 | 313 | 53 |
| 1971-07-07 | vs HOU | 86 | L 4-18 | 52-34 | 1 | 5,791 | Steve Stone | Larry Dierker | Larry Dierker | Steve Stone | Jim Ray | 370 | 331 | 39 |
| 1971-07-08 | vs HOU | 87 | W 4-2 | 53-34 | 1 | 6,849 | John Cumberland | Don Wilson | John Cumberland | Don Wilson | | 374 | 333 | 41 |
| 1971-07-09 | @ LAN | 88 | W 7-4 | 54-34 | 1 | 53,564 | Juan Marichal | Claude Osteen | Don McMahon | Jim Brewer | Jerry Johnson | 381 | 337 | 44 |
| 1971-07-10 | @ LAN | 89 | W 3-1 | 55-34 | 1 | 52,715 | Gaylord Perry | Don Sutton | Gaylord Perry | Don Sutton | Jerry Johnson | 384 | 338 | 46 |
| 1971-07-11 | @ LAN | 90 | L 3-11 | 55-35 | 1 | 41,825 | Ron Bryant | Al Downing | Al Downing | Ron Bryant | | 387 | 349 | 38 |
| 1971-07-15 | @ CIN | 91 | L 1-2 | 55-36 | 1 | 21,685 | John Cumberland | Don Gullett | Joe Gibbon | Jerry Johnson | | 388 | 351 | 37 |
| 1971-07-16 | @ CIN | 92 | W 4-3 | 56-36 | 1 | 45,053 | Gaylord Perry | Gary Nolan | Gaylord Perry | Gary Nolan | Jerry Johnson | 392 | 354 | 38 |
| 1971-07-17 | @ CIN | 93 | L 2-3 | 56-37 | 1 | 32,823 | Juan Marichal | Jim McGlothlin | Jim McGlothlin | Juan Marichal | | 394 | 357 | 37 |
| 1971-07-18 | @ ATL | 94 | W 5-4 | 57-38 | 1 | 0 | Don Carrithers | Jim Nash | Jerry Johnson | Bob Priddy | | 399 | 361 | 38 |
| 1971-07-18 | @ ATL | 95 | L 2-4 | 57-38 | 1 | 46,489 | Steve Stone | Tom Kelley | Tom Kelley | Steve Stone | Pat Jarvis | 401 | 365 | 36 |
| 1971-07-19 | @ ATL | 96 | W 11-8 | 58-38 | 1 | 13,361 | John Cumberland | Steve Barber | Don McMahon | Bob Priddy | Steve Hamilton | 412 | 373 | 39 |
| 1971-07-20 | @ PIT | 97 | L 7-11 | 58-39 | 1 | 29,865 | Gaylord Perry | Steve Blass | Bob Veale | Don Carrithers | Dave Giusti | 419 | 384 | 35 |
| 1971-07-21 | @ PIT | 98 | W 8-4 | 59-39 | 1 | 35,145 | Ron Bryant | Bob Johnson | Jerry Johnson | Dave Giusti | Steve Hamilton | 427 | 388 | 39 |
| 1971-07-22 | @ PIT | 99 | W 8-7 | 60-39 | 1 | 33,185 | Juan Marichal | Dock Ellis | Jerry Johnson | Bob Moose | | 435 | 395 | 40 |
| 1971-07-23 | vs CIN | 100 | L 2-3 | 60-40 | 1 | 17,733 | John Cumberland | Ross Grimsley | Clay Carroll | John Cumberland | | 437 | 398 | 39 |
| 1971-07-24 | vs CIN | 101 | W 6-1 | 61-40 | 1 | 26,132 | Don Carrithers | Wayne Simpson | Don Carrithers | Wayne Simpson | | 443 | 399 | 44 |
| 1971-07-25 | vs CIN | 102 | W 7-3 | 62-41 | 1 | 0 | Gaylord Perry | Gary Nolan | Gaylord Perry | Gary Nolan | | 450 | 402 | 48 |
| 1971-07-25 | vs CIN | 103 | L 2-5 | 62-41 | 1 | 28,792 | Ron Bryant | Don Gullett | Don Gullett | Ron Bryant | Clay Carroll | 452 | 407 | 45 |
| 1971-07-27 | vs ATL | 104 | L 3-4 | 62-42 | 1 | 9,021 | Juan Marichal | Pat Jarvis | Pat Jarvis | Juan Marichal | Cecil Upshaw | 455 | 411 | 44 |
| 1971-07-28 | vs ATL | 105 | W 2-1 | 63-42 | 1 | 7,580 | John Cumberland | George Stone | John Cumberland | Jim Nash | Jerry Johnson | 457 | 412 | 45 |
| 1971-07-29 | vs ATL | 106 | L 2-4 | 63-43 | 1 | 7,829 | Ron Bryant | Ron Reed | Ron Reed | Ron Bryant | | 459 | 416 | 43 |
| 1971-07-30 | vs PIT | 107 | W 5-2 | 64-43 | 1 | 10,088 | Gaylord Perry | Bruce Kison | Gaylord Perry | Bruce Kison | | 464 | 418 | 46 |
| 1971-07-31 | vs PIT | 108 | W 15-11 | 65-43 | 1 | 18,834 | Don Carrithers | Bob Johnson | Don McMahon | Dave Giusti | Steve Hamilton | 479 | 429 | 50 |
| 1971-08-01 | vs PIT | 109 | W 11-7 | 67-43 | 1 | 0 | Juan Marichal | Bob Moose | Jerry Johnson | Bruce Kison | Don McMahon | 490 | 436 | 54 |
| 1971-08-01 | vs PIT | 110 | W 8-3 | 67-43 | 1 | 33,301 | Frank Reberger | Dock Ellis | Frank Reberger | Dock Ellis | Don Carrithers | 498 | 439 | 59 |
| 1971-08-02 | vs LAN | 111 | L 4-5 | 67-44 | 1 | 23,892 | John Cumberland | Claude Osteen | Jose Pena | Steve Hamilton | Pete Mikkelsen | 502 | 444 | 58 |
| 1971-08-03 | vs LAN | 112 | L 1-9 | 67-45 | 1 | 21,226 | Ron Bryant | Doyle Alexander | Doyle Alexander | Ron Bryant | | 503 | 453 | 50 |
| 1971-08-04 | @ SLN | 113 | L 2-7 | 67-46 | 1 | 27,024 | Gaylord Perry | Bob Gibson | Bob Gibson | Gaylord Perry | | 505 | 460 | 45 |
| 1971-08-05 | @ SLN | 114 | L 2-3 | 67-47 | 1 | 18,641 | Juan Marichal | Reggie Cleveland | Reggie Cleveland | Juan Marichal | Moe Drabowsky | 507 | 463 | 44 |
| 1971-08-06 | @ SLN | 115 | L 8-12 | 67-48 | 1 | 27,192 | John Cumberland | Chris Zachary | Don Shaw | Don McMahon | Daryl Patterson | 515 | 475 | 40 |
| 1971-08-07 | @ CHN | 116 | L 5-6 | 67-49 | 1 | 36,715 | Don Carrithers | Fergie Jenkins | Fergie Jenkins | Don Carrithers | | 520 | 481 | 39 |
| 1971-08-08 | @ CHN | 117 | W 4-2 | 68-50 | 1 | 0 | Gaylord Perry | Bill Hands | Gaylord Perry | Bill Hands | | 524 | 483 | 41 |
| 1971-08-08 | @ CHN | 118 | L 0-8 | 68-50 | 1 | 43,066 | Ron Bryant | Milt Pappas | Milt Pappas | Ron Bryant | | 524 | 491 | 33 |
| 1971-08-10 | vs MON | 119 | W 1-0 | 69-50 | 1 | 6,879 | Juan Marichal | Bill Stoneman | Juan Marichal | Bill Stoneman | | 525 | 491 | 34 |
| 1971-08-11 | vs MON | 120 | L 0-5 | 69-51 | 1 | 6,697 | John Cumberland | Steve Renko | Steve Renko | John Cumberland | | 525 | 496 | 29 |
| 1971-08-13 | vs NYN | 121 | W 7-3 | 70-51 | 1 | 10,269 | Gaylord Perry | Ray Sadecki | Gaylord Perry | Ray Sadecki | | 532 | 499 | 33 |
| 1971-08-14 | vs NYN | 122 | W 6-5 | 71-51 | 1 | 19,060 | Don Carrithers | Jerry Koosman | Don McMahon | Tug McGraw | | 538 | 504 | 34 |
| 1971-08-15 | vs NYN | 123 | W 6-1 | 72-51 | 1 | 22,320 | Juan Marichal | Jim McAndrew | Juan Marichal | Jim McAndrew | | 544 | 505 | 39 |
| 1971-08-17 | vs PHI | 124 | W 5-1 | 73-51 | 1 | 8,973 | Gaylord Perry | Ken Reynolds | Gaylord Perry | Ken Reynolds | | 549 | 506 | 43 |
| 1971-08-18 | vs PHI | 125 | W 7-0 | 74-51 | 1 | 10,663 | John Cumberland | Rick Wise | John Cumberland | Rick Wise | | 556 | 506 | 50 |
| 1971-08-20 | @ MON | 126 | L 1-4 | 74-52 | 1 | 26,122 | Juan Marichal | Bill Stoneman | Bill Stoneman | Juan Marichal | | 557 | 510 | 47 |
| 1971-08-21 | @ MON | 127 | L 3-4 | 74-53 | 1 | 23,242 | Gaylord Perry | Steve Renko | Mike Marshall | Jerry Johnson | | 560 | 514 | 46 |
| 1971-08-22 | @ MON | 128 | L 3-6 | 74-54 | 1 | 28,102 | John Cumberland | Ernie McAnally | Ernie McAnally | Jim Barr | | 563 | 520 | 43 |
| 1971-08-23 | @ NYN | 129 | W 5-4 | 75-54 | 1 | 42,293 | Don Carrithers | Jim McAndrew | Don Carrithers | Jim McAndrew | Jerry Johnson | 568 | 524 | 44 |
| 1971-08-24 | @ NYN | 130 | W 3-2 | 76-54 | 1 | 47,670 | Juan Marichal | Ray Sadecki | Juan Marichal | Ray Sadecki | | 571 | 526 | 45 |
| 1971-08-25 | @ NYN | 131 | L 1-5 | 76-55 | 1 | 44,094 | Gaylord Perry | Jerry Koosman | Jerry Koosman | Gaylord Perry | | 572 | 531 | 41 |
| 1971-08-28 | @ PHI | 132 | W 5-2 | 77-56 | 1 | 0 | Don Carrithers | Woodie Fryman | Steve Hamilton | Woodie Fryman | Jerry Johnson | 577 | 533 | 44 |
| 1971-08-28 | @ PHI | 133 | L 3-7 | 77-56 | 1 | 33,012 | John Cumberland | Rick Wise | Rick Wise | John Cumberland | | 580 | 540 | 40 |
| 1971-08-29 | @ PHI | 134 | W 8-3 | 78-56 | 1 | 26,825 | Juan Marichal | Ken Reynolds | Juan Marichal | Ken Reynolds | | 588 | 543 | 45 |
| 1971-08-31 | vs ATL | 135 | W 9-0 | 79-56 | 1 | 13,615 | Gaylord Perry | George Stone | Gaylord Perry | George Stone | | 597 | 543 | 54 |
| 1971-09-01 | vs ATL | 136 | W 4-0 | 80-56 | 1 | 10,760 | John Cumberland | Ron Reed | John Cumberland | Ron Reed | | 601 | 543 | 58 |
| 1971-09-03 | vs HOU | 137 | W 16-6 | 81-56 | 1 | 9,120 | Juan Marichal | Wade Blasingame | Jim Barr | Jim Ray | Jerry Johnson | 617 | 549 | 68 |
| 1971-09-04 | vs HOU | 138 | W 1-0 | 82-56 | 1 | 10,698 | Don Carrithers | Ken Forsch | Don Carrithers | Ken Forsch | | 618 | 549 | 69 |
| 1971-09-05 | vs HOU | 139 | L 0-1 | 82-58 | 1 | 0 | Gaylord Perry | Jack Billingham | Jack Billingham | Gaylord Perry | | 618 | 550 | 68 |
| 1971-09-05 | vs HOU | 140 | L 3-5 | 82-58 | 1 | 25,527 | Jim Willoughby | J.R. Richard | J.R. Richard | Jim Willoughby | | 621 | 555 | 66 |
| 1971-09-06 | @ LAN | 141 | L 2-5 | 82-59 | 1 | 37,002 | John Cumberland | Don Sutton | Don Sutton | John Cumberland | Jim Brewer | 623 | 560 | 63 |
| 1971-09-07 | @ LAN | 142 | L 3-9 | 82-60 | 1 | 36,356 | Ron Bryant | Claude Osteen | Claude Osteen | Ron Bryant | | 626 | 569 | 57 |
| 1971-09-08 | @ LAN | 143 | L 0-3 | 82-61 | 1 | 51,009 | Juan Marichal | Bill Singer | Bill Singer | Juan Marichal | Jim Brewer | 626 | 572 | 54 |
| 1971-09-10 | @ ATL | 144 | L 5-7 | 82-62 | 1 | 8,403 | Gaylord Perry | Phil Niekro | Jim Nash | Jerry Johnson | | 631 | 579 | 52 |
| 1971-09-11 | @ ATL | 145 | L 4-5 | 82-63 | 1 | 11,365 | Don Carrithers | Tom Kelley | Cecil Upshaw | Don McMahon | | 635 | 584 | 51 |
| 1971-09-12 | @ ATL | 146 | W 6-1 | 83-63 | 1 | 15,584 | John Cumberland | George Stone | John Cumberland | George Stone | | 641 | 585 | 56 |
| 1971-09-13 | vs LAN | 147 | L 4-5 | 83-64 | 1 | 31,081 | Juan Marichal | Bill Singer | Bill Singer | Juan Marichal | Jim Brewer | 645 | 590 | 55 |
| 1971-09-14 | vs LAN | 148 | L 5-6 | 83-65 | 1 | 31,907 | Gaylord Perry | Al Downing | Joe Moeller | Jerry Johnson | Hoyt Wilhelm | 650 | 596 | 54 |
| 1971-09-15 | vs CIN | 149 | L 2-4 | 83-66 | 1 | 6,488 | Don Carrithers | Jim McGlothlin | Jim McGlothlin | Don Carrithers | | 652 | 600 | 52 |
| 1971-09-16 | vs CIN | 150 | L 1-8 | 83-67 | 1 | 5,340 | John Cumberland | Ross Grimsley | Ross Grimsley | John Cumberland | | 653 | 608 | 45 |
| 1971-09-17 | vs SDN | 151 | W 7-5 | 84-67 | 1 | 9,331 | Juan Marichal | Steve Arlin | Juan Marichal | Steve Arlin | Jerry Johnson | 660 | 613 | 47 |
| 1971-09-18 | vs SDN | 152 | L 1-2 | 84-68 | 1 | 10,093 | Gaylord Perry | Clay Kirby | Clay Kirby | Gaylord Perry | | 661 | 615 | 46 |
| 1971-09-19 | vs SDN | 153 | W 4-1 | 85-68 | 1 | 31,135 | Don Carrithers | Dave Roberts | Don Carrithers | Dave Roberts | Jerry Johnson | 665 | 616 | 49 |
| 1971-09-21 | @ HOU | 154 | L 1-3 | 85-69 | 1 | 7,777 | John Cumberland | Jack Billingham | Jack Billingham | John Cumberland | | 666 | 619 | 47 |
| 1971-09-22 | @ HOU | 155 | W 3-1 | 86-69 | 1 | 11,208 | Juan Marichal | J.R. Richard | Juan Marichal | Tom Griffin | | 669 | 620 | 49 |
| 1971-09-23 | @ HOU | 156 | W 2-1 | 87-69 | 1 | 12,281 | Gaylord Perry | Don Wilson | Gaylord Perry | Don Wilson | | 671 | 621 | 50 |
| 1971-09-24 | @ CIN | 157 | L 5-6 | 87-70 | 1 | 17,105 | Don Carrithers | Ross Grimsley | Clay Carroll | Jerry Johnson | | 676 | 627 | 49 |
| 1971-09-25 | @ CIN | 158 | L 5-6 | 87-71 | 1 | 18,107 | John Cumberland | Don Gullett | Ed Sprague | Don McMahon | | 681 | 633 | 48 |
| 1971-09-26 | @ CIN | 159 | W 12-5 | 88-71 | 1 | 45,072 | Juan Marichal | Gary Nolan | Juan Marichal | Gary Nolan | | 693 | 638 | 55 |
| 1971-09-28 | @ SDN | 160 | W 7-1 | 89-71 | 1 | 13,242 | Gaylord Perry | Ed Acosta | Gaylord Perry | Ed Acosta | | 700 | 639 | 61 |
| 1971-09-29 | @ SDN | 161 | L 1-4 | 89-72 | 1 | 17,134 | John Cumberland | Clay Kirby | Clay Kirby | Jerry Johnson | | 701 | 643 | 58 |
| 1971-09-30 | @ SDN | 162 | W 5-1 | 90-72 | 1 | 34,861 | Juan Marichal | Dave Roberts | Juan Marichal | Dave Roberts | | 706 | 644 | 62 |