| 1971-04-05 | @ HOU | 1 | L 2-5 | 0-1 | 4 | 22,421 | Bill Singer | Larry Dierker | Larry Dierker | Bill Singer | | 2 | 5 | -3 |
| 1971-04-06 | @ HOU | 2 | W 2-0 | 1-1 | 4 | 11,883 | Claude Osteen | Don Wilson | Claude Osteen | Don Wilson | | 4 | 5 | -1 |
| 1971-04-07 | @ HOU | 3 | L 1-2 | 1-2 | 4 | 11,009 | Don Sutton | Wade Blasingame | Wade Blasingame | Don Sutton | George Culver | 5 | 7 | -2 |
| 1971-04-09 | vs SDN | 4 | L 3-6 | 1-3 | 5 | 31,413 | Bill Singer | Danny Coombs | Danny Coombs | Bill Singer | Al Severinsen | 8 | 13 | -5 |
| 1971-04-10 | vs SDN | 5 | W 9-2 | 2-3 | 4 | 19,705 | Claude Osteen | Dave Roberts | Claude Osteen | Dave Roberts | | 17 | 15 | 2 |
| 1971-04-11 | vs SDN | 6 | L 7-9 | 2-4 | 5 | 14,536 | Don Sutton | Tom Phoebus | Tom Phoebus | Don Sutton | Al Severinsen | 24 | 24 | 0 |
| 1971-04-12 | vs CHN | 7 | W 4-3 | 3-4 | 4 | 15,407 | Sandy Vance | Ken Holtzman | Sandy Vance | Ken Holtzman | Jim Brewer | 28 | 27 | 1 |
| 1971-04-13 | vs CHN | 8 | L 2-3 | 3-5 | 5 | 15,458 | Bill Singer | Milt Pappas | Milt Pappas | Bill Singer | | 30 | 30 | 0 |
| 1971-04-14 | vs SLN | 9 | L 1-7 | 3-6 | 6 | 11,644 | Claude Osteen | Jerry Reuss | Jerry Reuss | Claude Osteen | Frank Linzy | 31 | 37 | -6 |
| 1971-04-15 | vs SLN | 10 | W 2-1 | 4-6 | 5 | 12,632 | Al Downing | Reggie Cleveland | Al Downing | Reggie Cleveland | | 33 | 38 | -5 |
| 1971-04-16 | vs HOU | 11 | W 6-5 | 5-6 | 4 | 18,492 | Sandy Vance | Don Wilson | Pete Mikkelsen | George Culver | | 39 | 43 | -4 |
| 1971-04-17 | vs HOU | 12 | L 3-5 | 5-7 | 4 | 16,172 | Bill Singer | Wade Blasingame | Wade Blasingame | Bill Singer | Denny Lemaster | 42 | 48 | -6 |
| 1971-04-18 | vs HOU | 13 | L 6-8 | 5-8 | 4 | 19,097 | Claude Osteen | Jack Billingham | Jack Billingham | Claude Osteen | George Culver | 48 | 56 | -8 |
| 1971-04-19 | @ SDN | 14 | W 3-2 | 6-8 | 4 | 3,727 | Don Sutton | Dave Roberts | Pete Mikkelsen | Dave Roberts | | 51 | 58 | -7 |
| 1971-04-20 | @ SDN | 15 | W 6-2 | 7-8 | 4 | 4,523 | Al Downing | Steve Arlin | Al Downing | Steve Arlin | | 57 | 60 | -3 |
| 1971-04-21 | @ SDN | 16 | W 10-2 | 8-8 | 4 | 3,907 | Bill Singer | Danny Coombs | Bill Singer | Danny Coombs | | 67 | 62 | 5 |
| 1971-04-23 | @ CIN | 17 | W 3-0 | 9-8 | 4 | 31,589 | Claude Osteen | Jim Merritt | Claude Osteen | Jim Merritt | | 70 | 62 | 8 |
| 1971-04-24 | @ CIN | 18 | W 5-4 | 10-8 | 2 | 13,787 | Don Sutton | Wayne Simpson | Jim Brewer | Clay Carroll | Pete Mikkelsen | 75 | 66 | 9 |
| 1971-04-25 | @ CIN | 19 | W 4-2 | 11-9 | 2 | 0 | Bill Singer | Milt Wilcox | Bill Singer | Milt Wilcox | | 79 | 68 | 11 |
| 1971-04-25 | @ CIN | 20 | L 0-2 | 11-9 | 2 | 32,700 | Al Downing | Don Gullett | Don Gullett | Al Downing | | 79 | 70 | 9 |
| 1971-04-27 | @ PIT | 21 | W 7-5 | 12-9 | 2 | 6,518 | Claude Osteen | Dock Ellis | Sandy Vance | Dock Ellis | Pete Mikkelsen | 86 | 75 | 11 |
| 1971-04-28 | @ PIT | 22 | L 5-7 | 12-10 | 2 | 6,191 | Don Sutton | Steve Blass | Steve Blass | Bob O'Brien | Dave Giusti | 91 | 82 | 9 |
| 1971-04-29 | @ PIT | 23 | W 2-1 | 13-10 | 2 | 5,031 | Al Downing | Luke Walker | Pete Mikkelsen | Dave Giusti | | 93 | 83 | 10 |
| 1971-04-30 | @ ATL | 24 | L 2-7 | 13-11 | 2 | 7,759 | Bill Singer | Phil Niekro | Phil Niekro | Bill Singer | | 95 | 90 | 5 |
| 1971-05-01 | @ ATL | 25 | L 5-7 | 13-12 | 2 | 16,726 | Claude Osteen | George Stone | Mike McQueen | Sandy Vance | | 100 | 97 | 3 |
| 1971-05-02 | @ ATL | 26 | L 1-4 | 13-13 | 3 | 34,906 | Don Sutton | Ron Reed | Ron Reed | Don Sutton | | 101 | 101 | 0 |
| 1971-05-04 | vs CIN | 27 | W 2-0 | 14-13 | 2 | 17,283 | Al Downing | Jim McGlothlin | Al Downing | Jim McGlothlin | | 103 | 101 | 2 |
| 1971-05-05 | vs CIN | 28 | L 4-8 | 14-14 | 3 | 22,739 | Bill Singer | Wayne Simpson | Milt Wilcox | Bill Singer | Wayne Granger | 107 | 109 | -2 |
| 1971-05-06 | vs CIN | 29 | W 5-2 | 15-14 | 2 | 10,780 | Claude Osteen | Jim Merritt | Claude Osteen | Jim Merritt | | 112 | 111 | 1 |
| 1971-05-07 | vs PIT | 30 | L 2-3 | 15-15 | 3 | 44,275 | Don Sutton | Bob Johnson | Bob Johnson | Don Sutton | Mudcat Grant | 114 | 114 | 0 |
| 1971-05-08 | vs PIT | 31 | L 3-5 | 15-16 | 4 | 26,737 | Al Downing | Nelson Briles | Nelson Briles | Al Downing | Dave Giusti | 117 | 119 | -2 |
| 1971-05-09 | vs PIT | 32 | L 5-11 | 15-17 | 4 | 26,349 | Sandy Vance | Steve Blass | Bob Veale | Pete Mikkelsen | Mudcat Grant | 122 | 130 | -8 |
| 1971-05-11 | vs ATL | 33 | W 6-1 | 16-17 | 2 | 32,959 | Claude Osteen | Jim Nash | Claude Osteen | Jim Nash | | 128 | 131 | -3 |
| 1971-05-12 | vs ATL | 34 | W 5-0 | 17-17 | 2 | 15,702 | Don Sutton | George Stone | Don Sutton | George Stone | | 133 | 131 | 2 |
| 1971-05-14 | @ SFN | 35 | L 4-8 | 17-18 | 2 | 30,862 | Al Downing | Steve Stone | Jerry Johnson | Pete Mikkelsen | | 137 | 139 | -2 |
| 1971-05-15 | @ SFN | 36 | L 0-1 | 17-19 | 3 | 33,370 | Bill Singer | Juan Marichal | Juan Marichal | Bill Singer | | 137 | 140 | -3 |
| 1971-05-16 | @ SFN | 37 | W 9-6 | 18-19 | 2 | 33,981 | Claude Osteen | Gaylord Perry | Jim Brewer | Don McMahon | Joe Moeller | 146 | 146 | 0 |
| 1971-05-18 | @ SLN | 38 | L 5-6 | 18-20 | 4 | 14,753 | Don Sutton | Reggie Cleveland | Moe Drabowsky | Jim Brewer | | 151 | 152 | -1 |
| 1971-05-19 | @ SLN | 39 | W 6-5 | 19-20 | 3 | 13,869 | Al Downing | Bob Gibson | Pete Mikkelsen | Bob Gibson | | 157 | 157 | 0 |
| 1971-05-20 | @ SLN | 40 | L 0-5 | 19-21 | 3 | 11,875 | Bill Singer | Steve Carlton | Steve Carlton | Bill Singer | | 157 | 162 | -5 |
| 1971-05-21 | @ CHN | 41 | W 8-1 | 20-21 | 3 | 11,859 | Claude Osteen | Bill Hands | Claude Osteen | Bill Hands | | 165 | 163 | 2 |
| 1971-05-22 | @ CHN | 42 | L 2-5 | 20-22 | 4 | 27,538 | Don Sutton | Milt Pappas | Milt Pappas | Don Sutton | | 167 | 168 | -1 |
| 1971-05-23 | @ CHN | 43 | W 4-3 | 21-22 | 2 | 27,168 | Al Downing | Fergie Jenkins | Pete Mikkelsen | Fergie Jenkins | Jim Brewer | 171 | 171 | 0 |
| 1971-05-25 | vs SFN | 44 | L 1-9 | 21-23 | 4 | 40,042 | Bill Singer | Juan Marichal | Juan Marichal | Bill Singer | | 172 | 180 | -8 |
| 1971-05-26 | vs SFN | 45 | L 4-6 | 21-24 | 4 | 27,541 | Claude Osteen | Gaylord Perry | Gaylord Perry | Joe Moeller | John Cumberland | 176 | 186 | -10 |
| 1971-05-27 | vs SFN | 46 | W 5-1 | 22-24 | 4 | 24,723 | Don Sutton | Ron Bryant | Don Sutton | Ron Bryant | | 181 | 187 | -6 |
| 1971-05-28 | vs PHI | 47 | W 6-2 | 23-24 | 3 | 27,309 | Al Downing | Chris Short | Al Downing | Chris Short | | 187 | 189 | -2 |
| 1971-05-29 | vs PHI | 48 | W 9-3 | 24-24 | 3 | 35,843 | Bill Singer | Rick Wise | Bill Singer | Rick Wise | | 196 | 192 | 4 |
| 1971-05-30 | vs PHI | 49 | W 2-1 | 25-24 | 2 | 36,385 | Claude Osteen | Ken Reynolds | Jim Brewer | Bucky Brandon | | 198 | 193 | 5 |
| 1971-05-31 | vs MON | 50 | W 4-0 | 26-24 | 2 | 22,195 | Don Sutton | Ernie McAnally | Don Sutton | Ernie McAnally | Jim Brewer | 202 | 193 | 9 |
| 1971-06-01 | vs MON | 51 | L 2-5 | 26-25 | 3 | 10,571 | Al Downing | Steve Renko | Steve Renko | Al Downing | Mike Marshall | 204 | 198 | 6 |
| 1971-06-02 | vs MON | 52 | W 7-1 | 27-25 | 2 | 10,911 | Bill Singer | Carl Morton | Bob O'Brien | Carl Morton | | 211 | 199 | 12 |
| 1971-06-04 | vs NYN | 53 | L 1-3 | 27-26 | 2 | 32,495 | Claude Osteen | Tom Seaver | Tom Seaver | Claude Osteen | | 212 | 202 | 10 |
| 1971-06-05 | vs NYN | 54 | W 3-0 | 28-26 | 2 | 27,801 | Don Sutton | Nolan Ryan | Don Sutton | Nolan Ryan | Pete Mikkelsen | 215 | 202 | 13 |
| 1971-06-06 | vs NYN | 55 | W 4-3 | 29-26 | 2 | 48,227 | Al Downing | Jerry Koosman | Al Downing | Jerry Koosman | Jim Brewer | 219 | 205 | 14 |
| 1971-06-08 | @ PHI | 56 | W 4-2 | 30-26 | 2 | 21,388 | Bill Singer | Chris Short | Bill Singer | Chris Short | Jim Brewer | 223 | 207 | 16 |
| 1971-06-09 | @ PHI | 57 | L 4-9 | 30-27 | 2 | 19,004 | Claude Osteen | Ken Reynolds | Ken Reynolds | Claude Osteen | Woodie Fryman | 227 | 216 | 11 |
| 1971-06-10 | @ PHI | 58 | L 2-4 | 30-28 | 2 | 19,493 | Don Sutton | Rick Wise | Rick Wise | Don Sutton | | 229 | 220 | 9 |
| 1971-06-11 | @ MON | 59 | W 12-1 | 31-28 | 2 | 20,929 | Al Downing | Jim Britton | Al Downing | Jim Britton | | 241 | 221 | 20 |
| 1971-06-12 | @ MON | 60 | W 5-3 | 32-28 | 2 | 21,576 | Bill Singer | Bill Stoneman | Bill Singer | Bill Stoneman | Jim Brewer | 246 | 224 | 22 |
| 1971-06-13 | @ MON | 61 | W 7-1 | 33-28 | 2 | 28,116 | Claude Osteen | Steve Renko | Claude Osteen | Steve Renko | | 253 | 225 | 28 |
| 1971-06-14 | @ NYN | 62 | W 3-2 | 34-28 | 2 | 35,233 | Don Sutton | Tom Seaver | Don Sutton | Tom Seaver | Jim Brewer | 256 | 227 | 29 |
| 1971-06-15 | @ NYN | 63 | W 2-0 | 35-28 | 2 | 36,512 | Al Downing | Nolan Ryan | Al Downing | Nolan Ryan | | 258 | 227 | 31 |
| 1971-06-16 | @ NYN | 64 | L 2-7 | 35-29 | 2 | 23,823 | Bill Singer | Charlie Williams | Charlie Williams | Bill Singer | Tug McGraw | 260 | 234 | 26 |
| 1971-06-18 | vs HOU | 65 | W 5-4 | 36-29 | 2 | 20,756 | Claude Osteen | Don Wilson | Claude Osteen | Don Wilson | Jim Brewer | 265 | 238 | 27 |
| 1971-06-19 | vs HOU | 66 | W 4-0 | 37-29 | 2 | 24,677 | Don Sutton | Jack Billingham | Don Sutton | Jack Billingham | | 269 | 238 | 31 |
| 1971-06-20 | vs HOU | 67 | L 7-9 | 37-30 | 2 | 24,277 | Al Downing | Larry Dierker | Jim Ray | Al Downing | Fred Gladding | 276 | 247 | 29 |
| 1971-06-21 | vs SLN | 68 | W 4-0 | 38-30 | 2 | 18,480 | Bob O'Brien | Bob Gibson | Bob O'Brien | Bob Gibson | | 280 | 247 | 33 |
| 1971-06-22 | vs SLN | 69 | L 5-6 | 38-31 | 2 | 21,004 | Claude Osteen | Steve Carlton | Steve Carlton | Claude Osteen | | 285 | 253 | 32 |
| 1971-06-23 | vs SLN | 70 | L 1-3 | 38-32 | 2 | 19,910 | Don Sutton | Jerry Reuss | Moe Drabowsky | Jim Brewer | Don Shaw | 286 | 256 | 30 |
| 1971-06-24 | vs SLN | 71 | W 11-4 | 39-32 | 2 | 19,282 | Al Downing | Reggie Cleveland | Al Downing | Reggie Cleveland | Jose Pena | 297 | 260 | 37 |
| 1971-06-25 | vs SDN | 72 | L 4-5 | 39-33 | 2 | 40,388 | Bob O'Brien | Dave Roberts | Dave Roberts | Pete Mikkelsen | Dick Kelley | 301 | 265 | 36 |
| 1971-06-26 | vs SDN | 73 | W 4-2 | 41-33 | 2 | 0 | Claude Osteen | Fred Norman | Claude Osteen | Fred Norman | Jim Brewer | 305 | 267 | 38 |
| 1971-06-26 | vs SDN | 74 | W 4-3 | 41-33 | 2 | 28,213 | Doyle Alexander | Steve Arlin | Jim Brewer | Danny Coombs | | 309 | 270 | 39 |
| 1971-06-27 | vs SDN | 75 | W 7-2 | 42-33 | 2 | 17,555 | Don Sutton | Tom Phoebus | Don Sutton | Tom Phoebus | | 316 | 272 | 44 |
| 1971-06-28 | @ CHN | 76 | W 6-4 | 43-33 | 2 | 16,567 | Al Downing | Milt Pappas | Al Downing | Milt Pappas | Jim Brewer | 322 | 276 | 46 |
| 1971-06-29 | @ CHN | 77 | L 2-3 | 43-34 | 2 | 16,580 | Bob O'Brien | Bill Hands | Bill Hands | Joe Moeller | Phil Regan | 324 | 279 | 45 |
| 1971-06-30 | @ CHN | 78 | L 5-10 | 43-35 | 2 | 22,283 | Claude Osteen | Ken Holtzman | Ken Holtzman | Claude Osteen | | 329 | 289 | 40 |
| 1971-07-01 | @ SDN | 79 | W 2-1 | 44-35 | 2 | 5,555 | Don Sutton | Fred Norman | Don Sutton | Fred Norman | | 331 | 290 | 41 |
| 1971-07-02 | @ SDN | 80 | W 9-2 | 45-35 | 2 | 10,027 | Doyle Alexander | Clay Kirby | Doyle Alexander | Clay Kirby | | 340 | 292 | 48 |
| 1971-07-03 | @ SDN | 81 | W 1-0 | 46-35 | 2 | 39,105 | Al Downing | Dave Roberts | Al Downing | Dave Roberts | | 341 | 292 | 49 |
| 1971-07-04 | @ SFN | 82 | W 14-4 | 47-35 | 2 | 30,663 | Claude Osteen | Juan Marichal | Pete Mikkelsen | Jerry Johnson | | 355 | 296 | 59 |
| 1971-07-05 | @ SFN | 83 | W 7-3 | 48-35 | 2 | 29,518 | Don Sutton | Gaylord Perry | Don Sutton | Gaylord Perry | Jim Brewer | 362 | 299 | 63 |
| 1971-07-06 | vs CHN | 84 | L 1-3 | 48-36 | 2 | 18,671 | Bob O'Brien | Fergie Jenkins | Fergie Jenkins | Bob O'Brien | | 363 | 302 | 61 |
| 1971-07-07 | vs CHN | 85 | L 5-6 | 48-38 | 2 | 0 | Al Downing | Milt Pappas | Milt Pappas | Al Downing | Phil Regan | 368 | 308 | 60 |
| 1971-07-07 | vs CHN | 86 | L 3-4 | 48-38 | 2 | 31,604 | Doyle Alexander | Juan Pizarro | Juan Pizarro | Doyle Alexander | Ray Newman | 371 | 312 | 59 |
| 1971-07-08 | vs CHN | 87 | L 2-4 | 48-39 | 2 | 21,166 | Joe Moeller | Ken Holtzman | Ken Holtzman | Joe Moeller | | 373 | 316 | 57 |
| 1971-07-09 | vs SFN | 88 | L 4-7 | 48-40 | 2 | 53,564 | Claude Osteen | Juan Marichal | Don McMahon | Jim Brewer | Jerry Johnson | 377 | 323 | 54 |
| 1971-07-10 | vs SFN | 89 | L 1-3 | 48-41 | 2 | 52,715 | Don Sutton | Gaylord Perry | Gaylord Perry | Don Sutton | Jerry Johnson | 378 | 326 | 52 |
| 1971-07-11 | vs SFN | 90 | W 11-3 | 49-41 | 2 | 41,825 | Al Downing | Ron Bryant | Al Downing | Ron Bryant | | 389 | 329 | 60 |
| 1971-07-15 | @ ATL | 91 | W 6-0 | 50-41 | 2 | 11,431 | Claude Osteen | Ron Reed | Claude Osteen | Ron Reed | | 395 | 329 | 66 |
| 1971-07-16 | @ ATL | 92 | L 1-3 | 50-42 | 2 | 15,884 | Don Sutton | Phil Niekro | Phil Niekro | Don Sutton | | 396 | 332 | 64 |
| 1971-07-17 | @ ATL | 93 | L 0-10 | 50-43 | 2 | 21,698 | Doyle Alexander | George Stone | George Stone | Doyle Alexander | | 396 | 342 | 54 |
| 1971-07-18 | @ PIT | 94 | L 2-3 | 50-45 | 2 | 0 | Al Downing | Bruce Kison | Dave Giusti | Al Downing | | 398 | 345 | 53 |
| 1971-07-18 | @ PIT | 95 | L 1-7 | 50-45 | 2 | 48,230 | Bill Singer | Luke Walker | Luke Walker | Bill Singer | | 399 | 352 | 47 |
| 1971-07-19 | @ PIT | 96 | W 10-4 | 51-45 | 2 | 17,437 | Claude Osteen | Nelson Briles | Claude Osteen | Nelson Briles | | 409 | 356 | 53 |
| 1971-07-20 | @ CIN | 97 | L 1-7 | 51-46 | 2 | 20,024 | Don Sutton | Don Gullett | Don Gullett | Don Sutton | Clay Carroll | 410 | 363 | 47 |
| 1971-07-21 | @ CIN | 98 | L 2-6 | 51-47 | 2 | 20,086 | Doyle Alexander | Gary Nolan | Gary Nolan | Doyle Alexander | | 412 | 369 | 43 |
| 1971-07-22 | @ CIN | 99 | W 8-4 | 52-47 | 2 | 26,744 | Al Downing | Jim McGlothlin | Al Downing | Jim McGlothlin | | 420 | 373 | 47 |
| 1971-07-23 | vs ATL | 100 | L 3-5 | 52-48 | 2 | 21,705 | Bill Singer | George Stone | George Stone | Bill Singer | Cecil Upshaw | 423 | 378 | 45 |
| 1971-07-24 | vs ATL | 101 | W 2-1 | 53-48 | 2 | 45,260 | Claude Osteen | Ron Reed | Jim Brewer | Bob Priddy | | 425 | 379 | 46 |
| 1971-07-25 | vs ATL | 102 | L 1-3 | 53-49 | 2 | 20,271 | Don Sutton | Phil Niekro | Phil Niekro | Don Sutton | | 426 | 382 | 44 |
| 1971-07-27 | vs PIT | 103 | W 8-5 | 54-49 | 2 | 26,564 | Al Downing | Dock Ellis | Doyle Alexander | Dock Ellis | Pete Mikkelsen | 434 | 387 | 47 |
| 1971-07-28 | vs PIT | 104 | L 0-4 | 54-50 | 2 | 30,798 | Bill Singer | Luke Walker | Luke Walker | Bill Singer | | 434 | 391 | 43 |
| 1971-07-29 | vs PIT | 105 | L 5-8 | 54-51 | 2 | 23,590 | Claude Osteen | Steve Blass | Bob Veale | Claude Osteen | Dave Giusti | 439 | 399 | 40 |
| 1971-07-30 | vs CIN | 106 | W 8-2 | 55-51 | 2 | 20,848 | Don Sutton | Gary Nolan | Don Sutton | Gary Nolan | | 447 | 401 | 46 |
| 1971-07-31 | vs CIN | 107 | W 4-1 | 56-51 | 2 | 26,087 | Al Downing | Don Gullett | Al Downing | Don Gullett | Jim Brewer | 451 | 402 | 49 |
| 1971-08-01 | vs CIN | 108 | W 5-4 | 57-51 | 2 | 20,323 | Bill Singer | Jim McGlothlin | Pete Mikkelsen | Joe Gibbon | | 456 | 406 | 50 |
| 1971-08-02 | @ SFN | 109 | W 5-4 | 58-51 | 2 | 23,892 | Claude Osteen | John Cumberland | Jose Pena | Steve Hamilton | Pete Mikkelsen | 461 | 410 | 51 |
| 1971-08-03 | @ SFN | 110 | W 9-1 | 59-51 | 2 | 21,226 | Doyle Alexander | Ron Bryant | Doyle Alexander | Ron Bryant | | 470 | 411 | 59 |
| 1971-08-04 | @ HOU | 111 | L 0-2 | 59-52 | 2 | 23,338 | Al Downing | Ken Forsch | Ken Forsch | Al Downing | | 470 | 413 | 57 |
| 1971-08-05 | @ HOU | 112 | W 3-0 | 60-52 | 2 | 17,893 | Bill Singer | Jack Billingham | Bill Singer | Jack Billingham | | 473 | 413 | 60 |
| 1971-08-07 | @ SLN | 113 | L 2-3 | 60-53 | 2 | 36,633 | Claude Osteen | Steve Carlton | Frank Linzy | Pete Mikkelsen | | 475 | 416 | 59 |
| 1971-08-08 | @ SLN | 114 | W 4-2 | 61-53 | 2 | 45,195 | Don Sutton | Jerry Reuss | Don Sutton | Jerry Reuss | Jim Brewer | 479 | 418 | 61 |
| 1971-08-09 | @ SLN | 115 | W 6-5 | 62-53 | 2 | 26,723 | Al Downing | Bob Gibson | Al Downing | Bob Gibson | Jim Brewer | 485 | 423 | 62 |
| 1971-08-10 | vs PHI | 116 | W 6-1 | 63-53 | 2 | 26,508 | Bill Singer | Barry Lersch | Bill Singer | Barry Lersch | | 491 | 424 | 67 |
| 1971-08-11 | vs PHI | 117 | W 4-1 | 64-53 | 2 | 20,135 | Doyle Alexander | Ken Reynolds | Doyle Alexander | Ken Reynolds | | 495 | 425 | 70 |
| 1971-08-12 | vs PHI | 118 | L 1-3 | 64-54 | 2 | 19,755 | Claude Osteen | Chris Short | Bucky Brandon | Pete Mikkelsen | | 496 | 428 | 68 |
| 1971-08-13 | vs MON | 119 | W 2-0 | 65-54 | 2 | 26,861 | Don Sutton | Carl Morton | Don Sutton | Carl Morton | | 498 | 428 | 70 |
| 1971-08-14 | vs MON | 120 | L 0-3 | 65-55 | 2 | 26,851 | Al Downing | Bill Stoneman | Bill Stoneman | Al Downing | | 498 | 431 | 67 |
| 1971-08-15 | vs MON | 121 | L 3-6 | 65-56 | 2 | 18,572 | Bill Singer | Steve Renko | Steve Renko | Bill Singer | | 501 | 437 | 64 |
| 1971-08-16 | vs NYN | 122 | L 0-6 | 65-57 | 2 | 26,821 | Doyle Alexander | Tom Seaver | Tom Seaver | Doyle Alexander | | 501 | 443 | 58 |
| 1971-08-17 | vs NYN | 123 | W 4-0 | 66-57 | 2 | 23,171 | Claude Osteen | Nolan Ryan | Claude Osteen | Nolan Ryan | | 505 | 443 | 62 |
| 1971-08-18 | vs NYN | 124 | L 2-3 | 66-58 | 2 | 27,203 | Don Sutton | Ray Sadecki | Danny Frisella | Jim Brewer | | 507 | 446 | 61 |
| 1971-08-20 | @ PHI | 125 | W 9-5 | 67-58 | 2 | 30,006 | Al Downing | Chris Short | Pete Mikkelsen | Chris Short | Jim Brewer | 516 | 451 | 65 |
| 1971-08-21 | @ PHI | 126 | L 0-3 | 67-59 | 2 | 46,633 | Bill Singer | Woodie Fryman | Woodie Fryman | Bill Singer | | 516 | 454 | 62 |
| 1971-08-22 | @ PHI | 127 | L 2-3 | 67-60 | 2 | 26,403 | Claude Osteen | Ken Reynolds | Ken Reynolds | Claude Osteen | Bill Wilson | 518 | 457 | 61 |
| 1971-08-23 | @ MON | 128 | L 6-12 | 67-61 | 2 | 16,291 | Don Sutton | John Strohmayer | John Strohmayer | Don Sutton | Mike Marshall | 524 | 469 | 55 |
| 1971-08-24 | @ MON | 129 | W 6-4 | 68-61 | 2 | 28,159 | Al Downing | Bill Stoneman | Al Downing | Bill Stoneman | Don Sutton | 530 | 473 | 57 |
| 1971-08-25 | @ MON | 130 | W 4-1 | 69-61 | 2 | 18,037 | Doyle Alexander | Steve Renko | Doyle Alexander | Steve Renko | Jim Brewer | 534 | 474 | 60 |
| 1971-08-28 | @ NYN | 131 | L 2-9 | 69-63 | 2 | 0 | Claude Osteen | Tom Seaver | Tom Seaver | Claude Osteen | | 536 | 483 | 53 |
| 1971-08-28 | @ NYN | 132 | L 1-2 | 69-63 | 2 | 43,492 | Don Sutton | Gary Gentry | Tug McGraw | Jim Brewer | | 537 | 485 | 52 |
| 1971-08-29 | @ NYN | 133 | L 3-4 | 69-64 | 2 | 44,255 | Bill Singer | Ray Sadecki | Tug McGraw | Bill Singer | | 540 | 489 | 51 |
| 1971-08-30 | @ HOU | 134 | W 3-2 | 70-64 | 2 | 6,410 | Al Downing | Ken Forsch | Al Downing | Ken Forsch | Jim Brewer | 543 | 491 | 52 |
| 1971-08-31 | @ HOU | 135 | W 6-1 | 71-64 | 2 | 7,340 | Doyle Alexander | Ron Cook | Doyle Alexander | Ron Cook | | 549 | 492 | 57 |
| 1971-09-01 | @ HOU | 136 | W 9-2 | 72-64 | 2 | 6,474 | Don Sutton | Jack Billingham | Don Sutton | Jack Billingham | | 558 | 494 | 64 |
| 1971-09-02 | @ HOU | 137 | L 3-9 | 72-65 | 2 | 7,508 | Claude Osteen | Don Wilson | Don Wilson | Claude Osteen | | 561 | 503 | 58 |
| 1971-09-03 | vs CIN | 138 | W 6-5 | 73-65 | 2 | 16,792 | Bill Singer | Don Gullett | Jose Pena | Joe Gibbon | | 567 | 508 | 59 |
| 1971-09-04 | vs CIN | 139 | W 2-1 | 74-65 | 2 | 21,148 | Al Downing | Jim McGlothlin | Al Downing | Jim McGlothlin | | 569 | 509 | 60 |
| 1971-09-05 | vs CIN | 140 | L 5-7 | 74-66 | 2 | 20,367 | Doyle Alexander | Ross Grimsley | Wayne Granger | Doyle Alexander | | 574 | 516 | 58 |
| 1971-09-06 | vs SFN | 141 | W 5-2 | 75-66 | 2 | 37,002 | Don Sutton | John Cumberland | Don Sutton | John Cumberland | Jim Brewer | 579 | 518 | 61 |
| 1971-09-07 | vs SFN | 142 | W 9-3 | 76-66 | 2 | 36,356 | Claude Osteen | Ron Bryant | Claude Osteen | Ron Bryant | | 588 | 521 | 67 |
| 1971-09-08 | vs SFN | 143 | W 3-0 | 77-66 | 2 | 51,009 | Bill Singer | Juan Marichal | Bill Singer | Juan Marichal | Jim Brewer | 591 | 521 | 70 |
| 1971-09-09 | @ SDN | 144 | W 3-2 | 78-66 | 2 | 7,627 | Al Downing | Fred Norman | Al Downing | Fred Norman | Hoyt Wilhelm | 594 | 523 | 71 |
| 1971-09-10 | @ SDN | 145 | W 6-2 | 79-66 | 2 | 13,367 | Don Sutton | Dave Roberts | Jim Brewer | Ed Acosta | | 600 | 525 | 75 |
| 1971-09-12 | @ SDN | 146 | W 6-3 | 80-66 | 2 | 6,950 | Claude Osteen | Steve Arlin | Joe Moeller | Steve Arlin | Hoyt Wilhelm | 606 | 528 | 78 |
| 1971-09-13 | @ SFN | 147 | W 5-4 | 81-66 | 2 | 31,081 | Bill Singer | Juan Marichal | Bill Singer | Juan Marichal | Jim Brewer | 611 | 532 | 79 |
| 1971-09-14 | @ SFN | 148 | W 6-5 | 82-66 | 2 | 31,907 | Al Downing | Gaylord Perry | Joe Moeller | Jerry Johnson | Hoyt Wilhelm | 617 | 537 | 80 |
| 1971-09-15 | vs SDN | 149 | L 1-2 | 82-67 | 2 | 19,004 | Don Sutton | Dave Roberts | Dave Roberts | Don Sutton | | 618 | 539 | 79 |
| 1971-09-16 | vs SDN | 150 | L 1-4 | 82-68 | 2 | 19,755 | Doyle Alexander | Fred Norman | Fred Norman | Doyle Alexander | | 619 | 543 | 76 |
| 1971-09-17 | vs ATL | 151 | L 2-3 | 82-69 | 2 | 32,952 | Claude Osteen | George Stone | Cecil Upshaw | Hoyt Wilhelm | | 621 | 546 | 75 |
| 1971-09-18 | vs ATL | 152 | L 6-9 | 82-70 | 2 | 25,482 | Bill Singer | Jim Nash | Gary Neibauer | Joe Moeller | Steve Barber | 627 | 555 | 72 |
| 1971-09-19 | vs ATL | 153 | W 12-0 | 84-70 | 2 | 0 | Al Downing | Phil Niekro | Al Downing | Phil Niekro | | 639 | 555 | 84 |
| 1971-09-19 | vs ATL | 154 | W 4-0 | 84-70 | 2 | 46,735 | Don Sutton | Ron Reed | Don Sutton | Ron Reed | | 643 | 555 | 88 |
| 1971-09-21 | @ CIN | 155 | L 3-9 | 84-71 | 2 | 10,131 | Claude Osteen | Don Gullett | Don Gullett | Claude Osteen | Wayne Granger | 646 | 564 | 82 |
| 1971-09-22 | @ CIN | 156 | L 1-4 | 84-72 | 2 | 10,013 | Bill Singer | Gary Nolan | Gary Nolan | Bill Singer | | 647 | 568 | 79 |
| 1971-09-24 | @ ATL | 157 | W 2-0 | 85-72 | 2 | 9,183 | Al Downing | Phil Niekro | Al Downing | Phil Niekro | | 649 | 568 | 81 |
| 1971-09-25 | @ ATL | 158 | W 5-4 | 86-72 | 2 | 7,887 | Don Sutton | Ron Reed | Don Sutton | Ron Reed | Jim Brewer | 654 | 572 | 82 |
| 1971-09-26 | @ ATL | 159 | W 5-2 | 87-72 | 2 | 18,923 | Claude Osteen | George Stone | Claude Osteen | George Stone | Jim Brewer | 659 | 574 | 85 |
| 1971-09-28 | vs HOU | 160 | W 2-1 | 88-72 | 2 | 29,628 | Bill Singer | Don Wilson | Bill Singer | Don Wilson | | 661 | 575 | 86 |
| 1971-09-29 | vs HOU | 161 | L 0-11 | 88-73 | 2 | 34,802 | Al Downing | Ken Forsch | Ken Forsch | Al Downing | | 661 | 586 | 75 |
| 1971-09-30 | vs HOU | 162 | W 2-1 | 89-73 | 2 | 52,684 | Don Sutton | Jack Billingham | Don Sutton | Jack Billingham | | 663 | 587 | 76 |