| 1971-04-06 | vs PHI | 1 | W 4-2 | 1-0 | 3 | 39,712 | Dock Ellis | Chris Short | Dock Ellis | Chris Short | | 4 | 2 | 2 |
| 1971-04-08 | vs PHI | 2 | W 2-0 | 2-0 | 1 | 12,289 | Luke Walker | Woodie Fryman | Luke Walker | Woodie Fryman | | 6 | 2 | 4 |
| 1971-04-09 | @ ATL | 3 | W 8-2 | 3-0 | 1 | 32,734 | Bob Moose | Pat Jarvis | Bob Moose | Pat Jarvis | Dave Giusti | 14 | 4 | 10 |
| 1971-04-10 | @ ATL | 4 | L 4-5 | 3-1 | 1 | 13,079 | Steve Blass | Phil Niekro | Cecil Upshaw | Nelson Briles | | 18 | 9 | 9 |
| 1971-04-11 | @ ATL | 5 | L 1-3 | 3-2 | 2 | 10,220 | Dock Ellis | Jim Nash | Jim Nash | Dock Ellis | | 19 | 12 | 7 |
| 1971-04-12 | @ PHI | 6 | W 4-3 | 4-2 | 2 | 19,469 | Bob Johnson | Rick Wise | Dave Giusti | Dick Selma | | 23 | 15 | 8 |
| 1971-04-13 | @ PHI | 7 | W 9-3 | 5-2 | 1 | 14,934 | Luke Walker | Chris Short | Nelson Briles | Chris Short | | 32 | 18 | 14 |
| 1971-04-14 | @ PHI | 8 | L 5-6 | 5-3 | 1 | 8,379 | Bob Moose | Woodie Fryman | Joe Hoerner | Mudcat Grant | Dick Selma | 37 | 24 | 13 |
| 1971-04-16 | @ NYN | 9 | L 0-1 | 5-4 | 2 | 18,491 | Dock Ellis | Tom Seaver | Tom Seaver | Dock Ellis | | 37 | 25 | 12 |
| 1971-04-17 | @ NYN | 10 | W 2-0 | 6-4 | 1 | 23,305 | Steve Blass | Jerry Koosman | Steve Blass | Jerry Koosman | | 39 | 25 | 14 |
| 1971-04-18 | @ NYN | 11 | L 2-5 | 7-5 | 2 | 0 | Luke Walker | Gary Gentry | Gary Gentry | Luke Walker | | 41 | 30 | 11 |
| 1971-04-18 | @ NYN | 12 | W 2-1 | 7-5 | 2 | 51,905 | Bob Johnson | Jim McAndrew | Bob Johnson | Tug McGraw | | 43 | 31 | 12 |
| 1971-04-20 | vs ATL | 13 | L 0-2 | 7-6 | 3 | 8,755 | Bob Moose | Phil Niekro | Phil Niekro | Bob Moose | | 43 | 33 | 10 |
| 1971-04-21 | vs ATL | 14 | W 10-2 | 8-6 | 2 | 7,992 | Dock Ellis | Jim Nash | Dock Ellis | Jim Nash | | 53 | 35 | 18 |
| 1971-04-22 | vs ATL | 15 | W 7-4 | 9-6 | 2 | 4,708 | Steve Blass | Ron Reed | Steve Blass | Ron Reed | Dave Giusti | 60 | 39 | 21 |
| 1971-04-23 | vs SFN | 16 | L 0-2 | 9-7 | 4 | 12,350 | Luke Walker | Steve Stone | Steve Stone | Luke Walker | | 60 | 41 | 19 |
| 1971-04-24 | vs SFN | 17 | L 0-2 | 9-8 | 4 | 8,386 | Bob Johnson | Ron Bryant | Ron Bryant | Bob Johnson | | 60 | 43 | 17 |
| 1971-04-25 | vs SFN | 18 | W 6-2 | 10-8 | 3 | 16,553 | Nelson Briles | Juan Marichal | Nelson Briles | Juan Marichal | Dave Giusti | 66 | 45 | 21 |
| 1971-04-27 | vs LAN | 19 | L 5-7 | 10-9 | 4 | 6,518 | Dock Ellis | Claude Osteen | Sandy Vance | Dock Ellis | Pete Mikkelsen | 71 | 52 | 19 |
| 1971-04-28 | vs LAN | 20 | W 7-5 | 11-9 | 3 | 6,191 | Steve Blass | Don Sutton | Steve Blass | Bob O'Brien | Dave Giusti | 78 | 57 | 21 |
| 1971-04-29 | vs LAN | 21 | L 1-2 | 11-10 | 3 | 5,031 | Luke Walker | Al Downing | Pete Mikkelsen | Dave Giusti | | 79 | 59 | 20 |
| 1971-04-30 | vs SDN | 22 | W 5-3 | 12-10 | 3 | 5,944 | Bob Johnson | Dave Roberts | Jim Nelson | Dick Kelley | Mudcat Grant | 84 | 62 | 22 |
| 1971-05-01 | vs SDN | 23 | W 5-4 | 13-10 | 2 | 6,068 | Bob Moose | Clay Kirby | Mudcat Grant | Bill Laxton | | 89 | 66 | 23 |
| 1971-05-02 | vs SDN | 24 | W 5-1 | 14-10 | 2 | 8,482 | Dock Ellis | Steve Arlin | Dock Ellis | Steve Arlin | Dave Giusti | 94 | 67 | 27 |
| 1971-05-04 | @ SFN | 25 | W 10-2 | 15-10 | 2 | 8,263 | Steve Blass | Steve Stone | Bob Moose | Steve Stone | Mudcat Grant | 104 | 69 | 35 |
| 1971-05-05 | @ SFN | 26 | L 1-2 | 15-11 | 3 | 5,212 | Luke Walker | Juan Marichal | Juan Marichal | Luke Walker | | 105 | 71 | 34 |
| 1971-05-07 | @ LAN | 27 | W 3-2 | 16-11 | 2 | 44,275 | Bob Johnson | Don Sutton | Bob Johnson | Don Sutton | Mudcat Grant | 108 | 73 | 35 |
| 1971-05-08 | @ LAN | 28 | W 5-3 | 17-11 | 2 | 26,737 | Nelson Briles | Al Downing | Nelson Briles | Al Downing | Dave Giusti | 113 | 76 | 37 |
| 1971-05-09 | @ LAN | 29 | W 11-5 | 18-11 | 2 | 26,349 | Steve Blass | Sandy Vance | Bob Veale | Pete Mikkelsen | Mudcat Grant | 124 | 81 | 43 |
| 1971-05-11 | @ SDN | 30 | W 10-4 | 19-11 | 2 | 4,440 | Dock Ellis | Danny Coombs | Dock Ellis | Danny Coombs | Dave Giusti | 134 | 85 | 49 |
| 1971-05-12 | @ SDN | 31 | L 1-2 | 19-12 | 2 | 4,292 | Luke Walker | Dave Roberts | Dave Roberts | Luke Walker | | 135 | 87 | 48 |
| 1971-05-14 | vs NYN | 32 | L 2-8 | 19-13 | 2 | 17,622 | Bob Johnson | Jerry Koosman | Jerry Koosman | Bob Johnson | | 137 | 95 | 42 |
| 1971-05-15 | vs NYN | 33 | L 5-9 | 19-14 | 3 | 22,042 | Steve Blass | Gary Gentry | Ray Sadecki | Steve Blass | | 142 | 104 | 38 |
| 1971-05-16 | vs NYN | 34 | W 4-2 | 20-14 | 2 | 18,968 | Dock Ellis | Nolan Ryan | Dock Ellis | Nolan Ryan | Dave Giusti | 146 | 106 | 40 |
| 1971-05-17 | vs MON | 35 | W 6-5 | 21-14 | 2 | 6,431 | Luke Walker | Carl Morton | Mudcat Grant | Mike Marshall | | 152 | 111 | 41 |
| 1971-05-18 | vs MON | 36 | W 3-2 | 22-14 | 2 | 10,226 | Bob Johnson | Bill Stoneman | Bob Johnson | Mike Marshall | | 155 | 113 | 42 |
| 1971-05-19 | @ CIN | 37 | W 6-1 | 23-14 | 1 | 11,109 | Bob Moose | Gary Nolan | Bob Moose | Gary Nolan | Dave Giusti | 161 | 114 | 47 |
| 1971-05-20 | @ CIN | 38 | L 4-5 | 23-15 | 1 | 9,530 | Steve Blass | Ross Grimsley | Milt Wilcox | Steve Blass | Clay Carroll | 165 | 119 | 46 |
| 1971-05-21 | @ MON | 39 | W 6-2 | 24-15 | 1 | 17,379 | Dock Ellis | Carl Morton | Mudcat Grant | Howie Reed | | 171 | 121 | 50 |
| 1971-05-22 | @ MON | 40 | L 2-5 | 24-16 | 3 | 18,814 | Luke Walker | Bill Stoneman | Bill Stoneman | Luke Walker | | 173 | 126 | 47 |
| 1971-05-23 | @ MON | 41 | L 2-4 | 24-17 | 3 | 27,216 | Bob Johnson | Ernie McAnally | Ernie McAnally | Bob Johnson | Mike Marshall | 175 | 130 | 45 |
| 1971-05-25 | vs CIN | 42 | L 4-7 | 24-18 | 3 | 8,607 | Bob Moose | Ross Grimsley | Ross Grimsley | Bob Moose | Joe Gibbon | 179 | 137 | 42 |
| 1971-05-26 | vs CIN | 43 | W 2-0 | 25-18 | 3 | 7,369 | Steve Blass | Tony Cloninger | Steve Blass | Tony Cloninger | | 181 | 137 | 44 |
| 1971-05-27 | vs CIN | 44 | W 5-2 | 26-18 | 3 | 7,408 | Dock Ellis | Jim Merritt | Dock Ellis | Jim Merritt | | 186 | 139 | 47 |
| 1971-05-28 | vs CHN | 45 | L 2-4 | 26-19 | 3 | 12,776 | Luke Walker | Milt Pappas | Milt Pappas | Luke Walker | | 188 | 143 | 45 |
| 1971-05-29 | vs CHN | 46 | W 9-4 | 27-19 | 3 | 12,336 | Bob Johnson | Bill Hands | Bob Johnson | Bill Hands | Dave Giusti | 197 | 147 | 50 |
| 1971-05-30 | vs CHN | 47 | W 10-0 | 28-19 | 3 | 14,643 | Bob Moose | Ken Holtzman | Bob Moose | Ken Holtzman | | 207 | 147 | 60 |
| 1971-05-31 | vs CHN | 48 | W 6-0 | 29-19 | 2 | 19,589 | Steve Blass | Fergie Jenkins | Steve Blass | Fergie Jenkins | | 213 | 147 | 66 |
| 1971-06-01 | vs SLN | 49 | W 9-0 | 30-19 | 2 | 21,516 | Dock Ellis | Chris Zachary | Dock Ellis | Chris Zachary | | 222 | 147 | 75 |
| 1971-06-02 | vs SLN | 50 | W 10-1 | 31-19 | 2 | 9,612 | Luke Walker | Reggie Cleveland | Luke Walker | Reggie Cleveland | Bob Veale | 232 | 148 | 84 |
| 1971-06-03 | vs SLN | 51 | L 1-7 | 31-20 | 3 | 18,947 | Bob Johnson | Steve Carlton | Steve Carlton | Bob Johnson | | 233 | 155 | 78 |
| 1971-06-04 | vs HOU | 52 | W 3-2 | 32-20 | 3 | 14,025 | Bob Moose | Jack Billingham | Bob Moose | Jack Billingham | Dave Giusti | 236 | 157 | 79 |
| 1971-06-05 | vs HOU | 53 | L 1-4 | 32-21 | 3 | 23,793 | Steve Blass | Larry Dierker | Larry Dierker | Steve Blass | Fred Gladding | 237 | 161 | 76 |
| 1971-06-06 | vs HOU | 54 | W 9-8 | 33-21 | 2 | 23,051 | Dock Ellis | Wade Blasingame | Dock Ellis | Wade Blasingame | Bob Veale | 246 | 169 | 77 |
| 1971-06-07 | @ CHN | 55 | W 11-6 | 34-21 | 2 | 16,478 | Nelson Briles | Milt Pappas | Bob Veale | Milt Pappas | Dave Giusti | 257 | 175 | 82 |
| 1971-06-08 | @ CHN | 56 | L 0-1 | 34-22 | 3 | 14,878 | Jim Nelson | Ken Holtzman | Ken Holtzman | Mudcat Grant | | 257 | 176 | 81 |
| 1971-06-09 | @ CHN | 57 | L 1-3 | 34-23 | 3 | 16,438 | Bob Moose | Fergie Jenkins | Fergie Jenkins | Bob Moose | | 258 | 179 | 79 |
| 1971-06-10 | @ SLN | 58 | W 3-1 | 35-23 | 2 | 18,950 | Steve Blass | Jerry Reuss | Steve Blass | Jerry Reuss | | 261 | 180 | 81 |
| 1971-06-11 | @ SLN | 59 | W 11-4 | 36-23 | 1 | 27,308 | Dock Ellis | Reggie Cleveland | Dock Ellis | Reggie Cleveland | Dave Giusti | 272 | 184 | 88 |
| 1971-06-12 | @ SLN | 60 | W 4-3 | 37-23 | 1 | 24,565 | Nelson Briles | Mike Torrez | Mudcat Grant | Rudy Arroyo | | 276 | 187 | 89 |
| 1971-06-13 | @ SLN | 61 | W 8-4 | 38-23 | 1 | 21,205 | Luke Walker | Steve Carlton | Dave Giusti | Steve Carlton | Ramon Hernandez | 284 | 191 | 93 |
| 1971-06-14 | @ HOU | 62 | L 4-5 | 38-24 | 1 | 11,655 | Bob Moose | Jack Billingham | Fred Gladding | Jim Nelson | | 288 | 196 | 92 |
| 1971-06-15 | @ HOU | 63 | W 3-0 | 39-24 | 1 | 16,307 | Steve Blass | Larry Dierker | Steve Blass | Larry Dierker | | 291 | 196 | 95 |
| 1971-06-16 | @ HOU | 64 | W 6-4 | 40-24 | 1 | 16,098 | Dock Ellis | Wade Blasingame | Dock Ellis | Wade Blasingame | | 297 | 200 | 97 |
| 1971-06-18 | vs MON | 65 | W 9-8 | 41-24 | 1 | 26,644 | Luke Walker | Steve Renko | Dave Giusti | Claude Raymond | | 306 | 208 | 98 |
| 1971-06-19 | vs MON | 66 | L 1-10 | 41-25 | 1 | 12,091 | Bob Moose | Carl Morton | Carl Morton | Bob Moose | | 307 | 218 | 89 |
| 1971-06-20 | vs MON | 67 | W 7-1 | 43-25 | 1 | 0 | Steve Blass | Bill Stoneman | Steve Blass | Bill Stoneman | | 314 | 219 | 95 |
| 1971-06-20 | vs MON | 68 | W 7-3 | 43-25 | 1 | 32,301 | Nelson Briles | Jim Britton | Nelson Briles | Jim Britton | Mudcat Grant | 321 | 222 | 99 |
| 1971-06-21 | vs NYN | 69 | W 6-0 | 44-25 | 1 | 19,751 | Dock Ellis | Jerry Koosman | Dock Ellis | Jerry Koosman | | 327 | 222 | 105 |
| 1971-06-22 | vs NYN | 70 | L 2-3 | 44-26 | 1 | 27,578 | Jim Nelson | Charlie Williams | Charlie Williams | Jim Nelson | Danny Frisella | 329 | 225 | 104 |
| 1971-06-23 | vs NYN | 71 | W 6-2 | 45-26 | 1 | 31,225 | Luke Walker | Gary Gentry | Luke Walker | Gary Gentry | Mudcat Grant | 335 | 227 | 108 |
| 1971-06-25 | @ PHI | 72 | W 14-4 | 46-26 | 1 | 38,736 | Steve Blass | Jim Bunning | Steve Blass | Jim Bunning | | 349 | 231 | 118 |
| 1971-06-26 | @ PHI | 73 | W 11-9 | 47-26 | 1 | 24,965 | Dock Ellis | Chris Short | Dock Ellis | Chris Short | Dave Giusti | 360 | 240 | 120 |
| 1971-06-27 | @ PHI | 74 | L 4-8 | 48-27 | 1 | 0 | Bob Johnson | Woodie Fryman | Woodie Fryman | Bob Johnson | Joe Hoerner | 364 | 248 | 116 |
| 1971-06-27 | @ PHI | 75 | W 10-9 | 48-27 | 1 | 37,062 | Nelson Briles | Ken Reynolds | Bob Veale | Joe Hoerner | Dave Giusti | 374 | 257 | 117 |
| 1971-06-28 | @ SLN | 76 | W 11-5 | 49-27 | 1 | 15,024 | Bob Moose | Jerry Reuss | Bob Moose | Jerry Reuss | Mudcat Grant | 385 | 262 | 123 |
| 1971-06-29 | @ SLN | 77 | L 3-8 | 49-28 | 1 | 14,586 | Luke Walker | Reggie Cleveland | Reggie Cleveland | Luke Walker | | 388 | 270 | 118 |
| 1971-06-30 | @ NYN | 78 | L 0-4 | 49-29 | 1 | 50,399 | Steve Blass | Nolan Ryan | Nolan Ryan | Steve Blass | Danny Frisella | 388 | 274 | 114 |
| 1971-07-01 | @ NYN | 79 | W 3-0 | 50-29 | 1 | 26,650 | Dock Ellis | Jerry Koosman | Dock Ellis | Jerry Koosman | Dave Giusti | 391 | 274 | 117 |
| 1971-07-02 | @ CHN | 80 | W 5-1 | 51-29 | 1 | 28,919 | Bob Moose | Fergie Jenkins | Bob Moose | Fergie Jenkins | | 396 | 275 | 121 |
| 1971-07-03 | @ CHN | 81 | L 1-3 | 51-30 | 1 | 31,422 | Bob Johnson | Milt Pappas | Milt Pappas | Bob Johnson | | 397 | 278 | 119 |
| 1971-07-04 | @ CHN | 82 | L 7-9 | 51-31 | 1 | 30,401 | Bruce Kison | Bill Hands | Phil Regan | Dave Giusti | Ray Newman | 404 | 287 | 117 |
| 1971-07-05 | @ CHN | 83 | W 6-2 | 52-31 | 1 | 37,734 | Steve Blass | Ken Holtzman | Steve Blass | Ken Holtzman | | 410 | 289 | 121 |
| 1971-07-06 | vs CIN | 84 | W 5-2 | 53-31 | 1 | 23,321 | Dock Ellis | Jim McGlothlin | Dock Ellis | Jim McGlothlin | Dave Giusti | 415 | 291 | 124 |
| 1971-07-07 | vs CIN | 85 | W 9-3 | 54-31 | 1 | 23,873 | Bob Johnson | Gary Nolan | Bob Johnson | Gary Nolan | | 424 | 294 | 130 |
| 1971-07-08 | vs CIN | 86 | W 7-1 | 55-31 | 1 | 22,534 | Bruce Kison | Don Gullett | Bruce Kison | Don Gullett | Dave Giusti | 431 | 295 | 136 |
| 1971-07-09 | vs ATL | 87 | W 11-2 | 56-31 | 1 | 29,678 | Nelson Briles | Jim Nash | Nelson Briles | Jim Nash | | 442 | 297 | 145 |
| 1971-07-10 | vs ATL | 88 | W 5-4 | 57-31 | 1 | 18,955 | Steve Blass | Phil Niekro | Mudcat Grant | Phil Niekro | Dave Giusti | 447 | 301 | 146 |
| 1971-07-15 | vs SDN | 89 | W 4-3 | 58-31 | 1 | 17,405 | Steve Blass | Dave Roberts | Jim Nelson | Danny Coombs | | 451 | 304 | 147 |
| 1971-07-16 | vs SDN | 90 | W 2-1 | 59-31 | 1 | 33,736 | Bob Johnson | Steve Arlin | Bob Johnson | Steve Arlin | | 453 | 305 | 148 |
| 1971-07-17 | vs SDN | 91 | W 9-2 | 60-31 | 1 | 14,278 | Dock Ellis | Fred Norman | Dock Ellis | Fred Norman | | 462 | 307 | 155 |
| 1971-07-18 | vs LAN | 92 | W 3-2 | 62-31 | 1 | 0 | Bruce Kison | Al Downing | Dave Giusti | Al Downing | | 465 | 309 | 156 |
| 1971-07-18 | vs LAN | 93 | W 7-1 | 62-31 | 1 | 48,230 | Luke Walker | Bill Singer | Luke Walker | Bill Singer | | 472 | 310 | 162 |
| 1971-07-19 | vs LAN | 94 | L 4-10 | 62-32 | 1 | 17,437 | Nelson Briles | Claude Osteen | Claude Osteen | Nelson Briles | | 476 | 320 | 156 |
| 1971-07-20 | vs SFN | 95 | W 11-7 | 63-32 | 1 | 29,865 | Steve Blass | Gaylord Perry | Bob Veale | Don Carrithers | Dave Giusti | 487 | 327 | 160 |
| 1971-07-21 | vs SFN | 96 | L 4-8 | 63-33 | 1 | 35,145 | Bob Johnson | Ron Bryant | Jerry Johnson | Dave Giusti | Steve Hamilton | 491 | 335 | 156 |
| 1971-07-22 | vs SFN | 97 | L 7-8 | 63-34 | 1 | 33,185 | Dock Ellis | Juan Marichal | Jerry Johnson | Bob Moose | | 498 | 343 | 155 |
| 1971-07-23 | @ SDN | 98 | W 4-0 | 64-34 | 1 | 10,133 | Bruce Kison | Clay Kirby | Bruce Kison | Clay Kirby | | 502 | 343 | 159 |
| 1971-07-24 | @ SDN | 99 | W 4-3 | 65-34 | 1 | 3,114 | Steve Blass | Dave Roberts | Steve Blass | Dave Roberts | Dave Giusti | 506 | 346 | 160 |
| 1971-07-25 | @ SDN | 100 | L 1-2 | 65-36 | 1 | 0 | Bob Johnson | Fred Norman | Fred Norman | Bob Johnson | | 507 | 348 | 159 |
| 1971-07-25 | @ SDN | 101 | L 0-2 | 65-36 | 1 | 10,342 | Bob Moose | Steve Arlin | Steve Arlin | Bob Moose | | 507 | 350 | 157 |
| 1971-07-27 | @ LAN | 102 | L 5-8 | 65-37 | 1 | 26,564 | Dock Ellis | Al Downing | Doyle Alexander | Dock Ellis | Pete Mikkelsen | 512 | 358 | 154 |
| 1971-07-28 | @ LAN | 103 | W 4-0 | 66-37 | 1 | 30,798 | Luke Walker | Bill Singer | Luke Walker | Bill Singer | | 516 | 358 | 158 |
| 1971-07-29 | @ LAN | 104 | W 8-5 | 67-37 | 1 | 23,590 | Steve Blass | Claude Osteen | Bob Veale | Claude Osteen | Dave Giusti | 524 | 363 | 161 |
| 1971-07-30 | @ SFN | 105 | L 2-5 | 67-38 | 1 | 10,088 | Bruce Kison | Gaylord Perry | Gaylord Perry | Bruce Kison | | 526 | 368 | 158 |
| 1971-07-31 | @ SFN | 106 | L 11-15 | 67-39 | 1 | 18,834 | Bob Johnson | Don Carrithers | Don McMahon | Dave Giusti | Steve Hamilton | 537 | 383 | 154 |
| 1971-08-01 | @ SFN | 107 | L 7-11 | 67-41 | 1 | 0 | Bob Moose | Juan Marichal | Jerry Johnson | Bruce Kison | Don McMahon | 544 | 394 | 150 |
| 1971-08-01 | @ SFN | 108 | L 3-8 | 67-41 | 1 | 33,301 | Dock Ellis | Frank Reberger | Frank Reberger | Dock Ellis | Don Carrithers | 547 | 402 | 145 |
| 1971-08-03 | @ MON | 109 | W 10-6 | 68-41 | 1 | 18,137 | Steve Blass | Carl Morton | Bob Veale | Carl Morton | Dave Giusti | 557 | 408 | 149 |
| 1971-08-04 | @ MON | 110 | L 3-4 | 68-42 | 1 | 17,481 | Luke Walker | Bill Stoneman | Mike Marshall | Mudcat Grant | | 560 | 412 | 148 |
| 1971-08-05 | @ MON | 111 | W 7-2 | 69-42 | 1 | 21,233 | Bruce Kison | John Strohmayer | Bruce Kison | John Strohmayer | | 567 | 414 | 153 |
| 1971-08-06 | vs PHI | 112 | L 2-3 | 69-43 | 1 | 21,323 | Dock Ellis | Ken Reynolds | Bill Wilson | Dock Ellis | | 569 | 417 | 152 |
| 1971-08-07 | vs PHI | 113 | L 3-5 | 69-44 | 1 | 29,565 | Bob Moose | Rick Wise | Rick Wise | Bob Moose | Bill Wilson | 572 | 422 | 150 |
| 1971-08-08 | vs PHI | 114 | L 2-3 | 70-45 | 1 | 0 | Steve Blass | Woodie Fryman | Woodie Fryman | Steve Blass | Joe Hoerner | 574 | 425 | 149 |
| 1971-08-08 | vs PHI | 115 | W 4-0 | 70-45 | 1 | 31,448 | Bob Johnson | Chris Short | Bob Johnson | Chris Short | | 578 | 425 | 153 |
| 1971-08-10 | vs CHN | 116 | L 1-2 | 70-46 | 1 | 21,789 | Bruce Kison | Juan Pizarro | Juan Pizarro | Bruce Kison | | 579 | 427 | 152 |
| 1971-08-11 | vs CHN | 117 | W 3-2 | 71-46 | 1 | 24,147 | Dock Ellis | Fergie Jenkins | Dock Ellis | Phil Regan | | 582 | 429 | 153 |
| 1971-08-12 | vs SLN | 118 | L 2-3 | 71-47 | 1 | 21,805 | Luke Walker | Steve Carlton | Steve Carlton | Luke Walker | | 584 | 432 | 152 |
| 1971-08-13 | vs SLN | 119 | L 0-2 | 71-48 | 1 | 31,563 | Steve Blass | Jerry Reuss | Jerry Reuss | Steve Blass | | 584 | 434 | 150 |
| 1971-08-14 | vs SLN | 120 | L 0-11 | 71-49 | 1 | 30,678 | Bob Johnson | Bob Gibson | Bob Gibson | Bob Johnson | | 584 | 445 | 139 |
| 1971-08-15 | vs SLN | 121 | L 4-6 | 71-50 | 1 | 49,329 | Bruce Kison | Reggie Cleveland | Frank Linzy | Bob Miller | Moe Drabowsky | 588 | 451 | 137 |
| 1971-08-16 | vs HOU | 122 | W 8-3 | 72-50 | 1 | 12,664 | Dock Ellis | Jack Billingham | Dock Ellis | Jack Billingham | Dave Giusti | 596 | 454 | 142 |
| 1971-08-17 | vs HOU | 123 | L 5-6 | 72-51 | 1 | 16,694 | Luke Walker | Wade Blasingame | Wade Blasingame | Bob Miller | Jim Ray | 601 | 460 | 141 |
| 1971-08-18 | vs HOU | 124 | W 3-2 | 73-51 | 1 | 29,670 | Steve Blass | Don Wilson | Bob Miller | Denny Lemaster | | 604 | 462 | 142 |
| 1971-08-19 | @ CIN | 125 | W 5-1 | 74-51 | 1 | 20,611 | Bob Johnson | Jim McGlothlin | Bob Johnson | Jim McGlothlin | | 609 | 463 | 146 |
| 1971-08-20 | @ CIN | 126 | L 0-6 | 74-52 | 1 | 26,452 | Bruce Kison | Ross Grimsley | Ross Grimsley | Bruce Kison | | 609 | 469 | 140 |
| 1971-08-21 | @ CIN | 127 | L 3-6 | 74-53 | 1 | 27,427 | Dock Ellis | Wayne Simpson | Jim Merritt | Dock Ellis | | 612 | 475 | 137 |
| 1971-08-22 | @ CIN | 128 | L 3-6 | 74-54 | 1 | 31,431 | Luke Walker | Gary Nolan | Gary Nolan | Nelson Briles | | 615 | 481 | 134 |
| 1971-08-23 | @ ATL | 129 | W 4-3 | 76-54 | 1 | 0 | Steve Blass | Phil Niekro | Steve Blass | Phil Niekro | Dave Giusti | 619 | 484 | 135 |
| 1971-08-23 | @ ATL | 130 | W 15-4 | 76-54 | 1 | 16,163 | Bob Moose | Tom Kelley | Bob Moose | Tom Kelley | Nelson Briles | 634 | 488 | 146 |
| 1971-08-24 | @ ATL | 131 | L 5-15 | 76-55 | 1 | 8,478 | Bob Johnson | Mike McQueen | Mike McQueen | Bob Johnson | Cecil Upshaw | 639 | 503 | 136 |
| 1971-08-25 | @ ATL | 132 | W 13-6 | 77-55 | 1 | 8,365 | Bruce Kison | Pat Jarvis | Bob Moose | Pat Jarvis | Bob Miller | 652 | 509 | 143 |
| 1971-08-27 | @ HOU | 133 | W 7-3 | 78-55 | 1 | 14,933 | Dock Ellis | Jack Billingham | Dock Ellis | Jack Billingham | Dave Giusti | 659 | 512 | 147 |
| 1971-08-28 | @ HOU | 134 | L 0-4 | 78-56 | 1 | 25,619 | Steve Blass | Don Wilson | Don Wilson | Steve Blass | | 659 | 516 | 143 |
| 1971-08-29 | @ HOU | 135 | W 5-2 | 79-56 | 1 | 15,723 | Bob Johnson | Wade Blasingame | Bob Johnson | Wade Blasingame | Dave Giusti | 664 | 518 | 146 |
| 1971-08-30 | vs PHI | 136 | W 6-4 | 80-56 | 1 | 13,399 | Nelson Briles | Chris Short | Luke Walker | Bill Wilson | Dave Giusti | 670 | 522 | 148 |
| 1971-08-31 | vs PHI | 137 | W 7-5 | 81-56 | 1 | 16,179 | Bob Moose | Barry Lersch | Bruce Kison | Joe Hoerner | Bob Miller | 677 | 527 | 150 |
| 1971-09-01 | vs PHI | 138 | W 10-7 | 82-56 | 1 | 11,278 | Dock Ellis | Woodie Fryman | Luke Walker | Bucky Brandon | | 687 | 534 | 153 |
| 1971-09-03 | vs MON | 139 | L 4-6 | 82-57 | 1 | 17,951 | Steve Blass | Steve Renko | Jim Britton | Dave Giusti | Mike Marshall | 691 | 540 | 151 |
| 1971-09-04 | vs MON | 140 | W 7-6 | 83-57 | 1 | 11,302 | Bob Johnson | Carl Morton | Dave Giusti | Mike Marshall | | 698 | 546 | 152 |
| 1971-09-05 | vs MON | 141 | W 8-2 | 84-57 | 1 | 15,897 | Bruce Kison | Bill Stoneman | Bruce Kison | Bill Stoneman | Ramon Hernandez | 706 | 548 | 158 |
| 1971-09-06 | vs CHN | 142 | W 4-1 | 86-57 | 1 | 39,236 | Nelson Briles | Juan Pizarro | Nelson Briles | Juan Pizarro | | 710 | 549 | 161 |
| 1971-09-06 | vs CHN | 143 | W 10-5 | 86-57 | 1 | 39,236 | Luke Walker | Ken Holtzman | Luke Walker | Ken Holtzman | Bob Moose | 720 | 554 | 166 |
| 1971-09-08 | vs CHN | 144 | W 10-1 | 87-57 | 1 | 15,937 | Steve Blass | Milt Pappas | Steve Blass | Milt Pappas | | 730 | 555 | 175 |
| 1971-09-10 | @ MON | 145 | L 2-3 | 87-58 | 1 | 21,529 | Bob Johnson | Bill Stoneman | John Strohmayer | Dave Giusti | | 732 | 558 | 174 |
| 1971-09-11 | @ MON | 146 | L 1-4 | 87-59 | 1 | 18,376 | Bruce Kison | Ernie McAnally | Ernie McAnally | Bruce Kison | | 733 | 562 | 171 |
| 1971-09-12 | @ MON | 147 | W 4-0 | 88-59 | 1 | 16,770 | Nelson Briles | Steve Renko | Nelson Briles | Steve Renko | | 737 | 562 | 175 |
| 1971-09-13 | @ CHN | 148 | W 5-1 | 89-59 | 1 | 6,477 | Steve Blass | Milt Pappas | Steve Blass | Milt Pappas | | 742 | 563 | 179 |
| 1971-09-14 | @ CHN | 149 | W 4-3 | 90-59 | 1 | 9,706 | Bob Johnson | Fergie Jenkins | Bob Moose | Fergie Jenkins | | 746 | 566 | 180 |
| 1971-09-15 | vs SLN | 150 | W 4-1 | 91-59 | 1 | 21,751 | Dock Ellis | Steve Carlton | Dock Ellis | Steve Carlton | Ramon Hernandez | 750 | 567 | 183 |
| 1971-09-16 | vs SLN | 151 | W 6-1 | 92-59 | 1 | 18,127 | Luke Walker | Jerry Reuss | Luke Walker | Jerry Reuss | Ramon Hernandez | 756 | 568 | 188 |
| 1971-09-17 | vs NYN | 152 | L 0-3 | 92-60 | 1 | 23,421 | Nelson Briles | Gary Gentry | Gary Gentry | Nelson Briles | | 756 | 571 | 185 |
| 1971-09-18 | vs NYN | 153 | W 4-0 | 93-60 | 1 | 20,470 | Steve Blass | Ray Sadecki | Steve Blass | Ray Sadecki | | 760 | 571 | 189 |
| 1971-09-19 | vs NYN | 154 | L 2-5 | 93-61 | 1 | 40,337 | Bob Johnson | Jerry Koosman | Charlie Williams | Bob Johnson | Danny Frisella | 762 | 576 | 186 |
| 1971-09-21 | @ SLN | 155 | L 4-6 | 93-62 | 1 | 13,348 | Dock Ellis | Jerry Reuss | Moe Drabowsky | Dock Ellis | | 766 | 582 | 184 |
| 1971-09-22 | @ SLN | 156 | W 5-1 | 94-62 | 1 | 14,845 | Luke Walker | Bob Gibson | Luke Walker | Bob Gibson | Dave Giusti | 771 | 583 | 188 |
| 1971-09-23 | @ SLN | 157 | W 5-0 | 95-62 | 1 | 10,918 | Nelson Briles | Reggie Cleveland | Nelson Briles | Reggie Cleveland | | 776 | 583 | 193 |
| 1971-09-24 | @ NYN | 158 | W 3-2 | 96-62 | 1 | 35,936 | Bruce Kison | Jerry Koosman | Bruce Kison | Jerry Koosman | Bob Miller | 779 | 585 | 194 |
| 1971-09-25 | @ NYN | 159 | L 1-2 | 96-63 | 1 | 29,295 | Bob Johnson | Jon Matlack | Danny Frisella | Ramon Hernandez | | 780 | 587 | 193 |
| 1971-09-26 | @ NYN | 160 | L 1-3 | 96-64 | 1 | 30,519 | Steve Blass | Tom Seaver | Tom Seaver | Steve Blass | | 781 | 590 | 191 |
| 1971-09-28 | @ PHI | 161 | L 3-6 | 96-65 | 1 | 14,582 | Dock Ellis | Rick Wise | Rick Wise | Dock Ellis | | 784 | 596 | 188 |
| 1971-09-30 | @ PHI | 162 | W 4-3 | 97-65 | 1 | 14,157 | Nelson Briles | Bill Champion | Bob Moose | Bill Champion | Dave Giusti | 788 | 599 | 189 |