| 1983-04-04 | @ BAL | 1 | W 7-2 | 1-0 | 1 | 51,889 | Larry Gura | Dennis Martinez | Larry Gura | Dennis Martinez | | 7 | 2 | 5 |
| 1983-04-06 | @ BAL | 2 | L 1-11 | 1-1 | 4 | 7,904 | Dennis Leonard | Mike Flanagan | Mike Flanagan | Dennis Leonard | | 8 | 13 | -5 |
| 1983-04-09 | vs MIL | 3 | W 5-2 | 2-1 | 2 | 17,078 | Larry Gura | Bob McClure | Larry Gura | Bob McClure | Dan Quisenberry | 13 | 15 | -2 |
| 1983-04-10 | vs MIL | 4 | L 5-9 | 2-2 | 2 | 18,047 | Vida Blue | Moose Haas | Tom Tellmann | Mike Armstrong | | 18 | 24 | -6 |
| 1983-04-11 | vs BOS | 5 | W 6-2 | 3-2 | 2 | 18,857 | Dennis Leonard | Bruce Hurst | Dennis Leonard | Bruce Hurst | Dan Quisenberry | 24 | 26 | -2 |
| 1983-04-12 | vs BOS | 6 | W 5-1 | 4-2 | 2 | 15,770 | Steve Renko | John Tudor | Mike Armstrong | John Tudor | | 29 | 27 | 2 |
| 1983-04-13 | vs BOS | 7 | L 4-18 | 4-3 | 3 | 13,275 | Paul Splittorff | Mike Brown | Mike Brown | Paul Splittorff | Bob Stanley | 33 | 45 | -12 |
| 1983-04-15 | @ MIL | 8 | W 4-3 | 5-3 | 2 | 54,049 | Larry Gura | Bob McClure | Larry Gura | Bob McClure | Dan Quisenberry | 37 | 48 | -11 |
| 1983-04-17 | @ MIL | 9 | L 3-6 | 5-4 | 4 | 22,128 | Steve Renko | Mike Caldwell | Mike Caldwell | Steve Renko | Pete Ladd | 40 | 54 | -14 |
| 1983-04-20 | @ DET | 10 | W 8-7 | 6-4 | 3 | 7,973 | Larry Gura | Jack Morris | Dan Quisenberry | Howard Bailey | | 48 | 61 | -13 |
| 1983-04-22 | vs TOR | 11 | W 6-5 | 7-4 | 1 | 16,172 | Dennis Leonard | Mike Morgan | Dennis Leonard | Roy Lee Jackson | Dan Quisenberry | 54 | 66 | -12 |
| 1983-04-23 | vs TOR | 12 | L 4-5 | 7-5 | 2 | 19,906 | Vida Blue | Luis Leal | Randy Moffitt | Dan Quisenberry | Joey McLaughlin | 58 | 71 | -13 |
| 1983-04-24 | vs TOR | 13 | W 7-1 | 8-5 | 1 | 18,522 | Steve Renko | Jim Gott | Steve Renko | Jim Gott | | 65 | 72 | -7 |
| 1983-04-26 | @ NYA | 14 | W 10-4 | 9-5 | 1 | 11,363 | Larry Gura | Dave Righetti | Larry Gura | Dave Righetti | | 75 | 76 | -1 |
| 1983-04-27 | @ NYA | 15 | L 0-6 | 9-6 | 2 | 16,639 | Dennis Leonard | Bob Shirley | Bob Shirley | Dennis Leonard | | 75 | 82 | -7 |
| 1983-04-29 | vs CLE | 16 | W 6-5 | 10-6 | 1 | 15,787 | Vida Blue | Len Barker | Mike Armstrong | Dan Spillner | | 81 | 87 | -6 |
| 1983-04-30 | vs CLE | 17 | L 1-5 | 10-7 | 2 | 20,873 | Steve Renko | Rick Sutcliffe | Rick Sutcliffe | Steve Renko | Neal Heaton | 82 | 92 | -10 |
| 1983-05-01 | vs CLE | 18 | L 1-2 | 10-8 | 3 | 18,199 | Larry Gura | Lary Sorensen | Lary Sorensen | Larry Gura | Dan Spillner | 83 | 94 | -11 |
| 1983-05-02 | vs NYA | 19 | W 4-1 | 11-8 | 3 | 32,434 | Dennis Leonard | Bob Shirley | Dennis Leonard | Bob Shirley | Dan Quisenberry | 87 | 95 | -8 |
| 1983-05-03 | vs NYA | 20 | W 5-2 | 12-8 | 1 | 18,929 | Paul Splittorff | Doyle Alexander | Paul Splittorff | Doyle Alexander | Dan Quisenberry | 92 | 97 | -5 |
| 1983-05-04 | vs NYA | 21 | L 1-8 | 12-9 | 2 | 22,913 | Vida Blue | Shane Rawley | Shane Rawley | Vida Blue | | 93 | 105 | -12 |
| 1983-05-06 | @ TOR | 22 | L 1-6 | 12-10 | 2 | 12,699 | Larry Gura | Dave Stieb | Dave Stieb | Larry Gura | | 94 | 111 | -17 |
| 1983-05-07 | @ TOR | 23 | L 4-7 | 12-11 | 3 | 15,527 | Dennis Leonard | Jim Clancy | Roy Lee Jackson | Dennis Leonard | Randy Moffitt | 98 | 118 | -20 |
| 1983-05-08 | @ TOR | 24 | W 6-1 | 13-11 | 2 | 25,753 | Steve Renko | Jim Gott | Steve Renko | Jim Gott | Dan Quisenberry | 104 | 119 | -15 |
| 1983-05-10 | @ CLE | 25 | L 1-4 | 13-12 | 3 | 6,195 | Vida Blue | Len Barker | Len Barker | Vida Blue | Neal Heaton | 105 | 123 | -18 |
| 1983-05-11 | @ CLE | 26 | L 0-2 | 13-13 | 3 | 7,748 | Larry Gura | Rick Sutcliffe | Rick Sutcliffe | Larry Gura | | 105 | 125 | -20 |
| 1983-05-13 | vs DET | 27 | W 5-2 | 14-13 | 3 | 22,990 | Dennis Leonard | Jack Morris | Dennis Leonard | Jack Morris | Dan Quisenberry | 110 | 127 | -17 |
| 1983-05-14 | vs DET | 28 | L 10-11 | 14-14 | 3 | 20,278 | Paul Splittorff | Dave Rucker | Dave Rozema | Don Hood | Aurelio Lopez | 120 | 138 | -18 |
| 1983-05-15 | vs DET | 29 | L 4-6 | 14-15 | 4 | 24,259 | Vida Blue | Milt Wilcox | Aurelio Lopez | Steve Renko | Dave Rozema | 124 | 144 | -20 |
| 1983-05-17 | @ BOS | 30 | L 1-4 | 14-16 | 4 | 17,063 | Larry Gura | John Tudor | John Tudor | Larry Gura | Bob Stanley | 125 | 148 | -23 |
| 1983-05-18 | @ BOS | 31 | W 2-1 | 15-16 | 4 | 17,374 | Dennis Leonard | Mike Brown | Dennis Leonard | Mike Brown | | 127 | 149 | -22 |
| 1983-05-20 | vs CHA | 32 | L 6-9 | 15-17 | 4 | 20,027 | Vida Blue | Britt Burns | Britt Burns | Vida Blue | Salome Barojas | 133 | 158 | -25 |
| 1983-05-21 | vs CHA | 33 | W 8-4 | 16-17 | 4 | 28,792 | Steve Renko | Floyd Bannister | Steve Renko | Floyd Bannister | | 141 | 162 | -21 |
| 1983-05-22 | vs CHA | 34 | L 3-11 | 16-18 | 4 | 31,210 | Larry Gura | LaMarr Hoyt | LaMarr Hoyt | Larry Gura | | 144 | 173 | -29 |
| 1983-05-23 | vs TEX | 35 | W 5-2 | 17-18 | 4 | 23,938 | Dennis Leonard | Charlie Hough | Dennis Leonard | Charlie Hough | Dan Quisenberry | 149 | 175 | -26 |
| 1983-05-24 | vs TEX | 36 | W 2-2 | 18-18 | 4 | 17,583 | Paul Splittorff | Mike Smithson | | | | 151 | 177 | -26 |
| 1983-05-25 | vs TEX | 37 | W 5-2 | 19-18 | 3 | 22,604 | Buddy Black | Danny Darwin | Buddy Black | Danny Darwin | Dan Quisenberry | 156 | 179 | -23 |
| 1983-05-26 | vs BAL | 38 | W 8-2 | 20-18 | 2 | 26,131 | Steve Renko | Mike Boddicker | Steve Renko | Mike Boddicker | | 164 | 181 | -17 |
| 1983-05-27 | vs BAL | 39 | L 4-7 | 20-19 | 2 | 23,675 | Larry Gura | Storm Davis | Storm Davis | Larry Gura | Tippy Martinez | 168 | 188 | -20 |
| 1983-05-28 | vs BAL | 40 | L 0-1 | 20-20 | 2 | 29,616 | Dennis Leonard | Scott McGregor | Scott McGregor | Mike Armstrong | | 168 | 189 | -21 |
| 1983-05-29 | vs BAL | 41 | W 4-0 | 21-20 | 2 | 29,035 | Paul Splittorff | Dennis Martinez | Paul Splittorff | Dennis Martinez | Dan Quisenberry | 172 | 189 | -17 |
| 1983-05-31 | @ TEX | 42 | W 6-5 | 22-20 | 2 | 10,448 | Buddy Black | Danny Darwin | Buddy Black | Danny Darwin | Dan Quisenberry | 178 | 194 | -16 |
| 1983-06-01 | @ TEX | 43 | L 4-7 | 22-21 | 2 | 11,729 | Steve Renko | Rick Honeycutt | Rick Honeycutt | Steve Renko | | 182 | 201 | -19 |
| 1983-06-02 | @ CHA | 44 | L 3-6 | 22-22 | 2 | 17,710 | Larry Gura | Richard Dotson | Juan Agosto | Larry Gura | | 185 | 207 | -22 |
| 1983-06-03 | @ CHA | 45 | L 0-2 | 22-23 | 2 | 19,533 | Keith Creel | Jerry Koosman | Jerry Koosman | Keith Creel | | 185 | 209 | -24 |
| 1983-06-04 | @ CHA | 46 | W 7-1 | 23-23 | 2 | 34,260 | Paul Splittorff | Britt Burns | Paul Splittorff | Britt Burns | | 192 | 210 | -18 |
| 1983-06-05 | @ CHA | 47 | W 7-5 | 24-24 | 2 | 0 | Buddy Black | Floyd Bannister | Dan Quisenberry | Kevin Hickey | | 199 | 215 | -16 |
| 1983-06-05 | @ CHA | 48 | L 2-5 | 24-24 | 2 | 31,377 | Vida Blue | LaMarr Hoyt | LaMarr Hoyt | Mike Armstrong | Juan Agosto | 201 | 220 | -19 |
| 1983-06-07 | vs MIN | 49 | W 9-4 | 25-24 | 2 | 21,173 | Larry Gura | Ken Schrom | Larry Gura | Ken Schrom | Dan Quisenberry | 210 | 224 | -14 |
| 1983-06-08 | vs MIN | 50 | W 9-2 | 26-24 | 2 | 20,103 | Steve Renko | Pete Filson | Steve Renko | Pete Filson | Dan Quisenberry | 219 | 226 | -7 |
| 1983-06-09 | vs MIN | 51 | W 6-5 | 27-24 | 2 | 26,869 | Keith Creel | Albert Williams | Bill Castro | Rick Lysander | Dan Quisenberry | 225 | 231 | -6 |
| 1983-06-10 | @ SEA | 52 | W 2-0 | 28-24 | 2 | 8,721 | Paul Splittorff | Bob Stoddard | Paul Splittorff | Bob Stoddard | Mike Armstrong | 227 | 231 | -4 |
| 1983-06-11 | @ SEA | 53 | W 4-1 | 29-24 | 2 | 16,661 | Buddy Black | Gaylord Perry | Buddy Black | Gaylord Perry | Dan Quisenberry | 231 | 232 | -1 |
| 1983-06-12 | @ SEA | 54 | L 1-8 | 29-25 | 2 | 11,833 | Larry Gura | Glenn Abbott | Glenn Abbott | Larry Gura | | 232 | 240 | -8 |
| 1983-06-13 | @ MIN | 55 | L 4-9 | 29-26 | 2 | 10,897 | Steve Renko | Bobby Castillo | Bobby Castillo | Steve Renko | | 236 | 249 | -13 |
| 1983-06-14 | @ MIN | 56 | L 1-8 | 29-27 | 3 | 7,303 | Keith Creel | Albert Williams | Albert Williams | Keith Creel | | 237 | 257 | -20 |
| 1983-06-15 | @ MIN | 57 | L 2-6 | 29-28 | 3 | 7,136 | Paul Splittorff | Frank Viola | Frank Viola | Paul Splittorff | | 239 | 263 | -24 |
| 1983-06-17 | vs SEA | 58 | W 3-1 | 30-28 | 2 | 26,130 | Larry Gura | Gaylord Perry | Larry Gura | Gaylord Perry | Dan Quisenberry | 242 | 264 | -22 |
| 1983-06-18 | vs SEA | 59 | W 6-5 | 31-28 | 2 | 24,254 | Buddy Black | Glenn Abbott | Dan Quisenberry | Bill Caudill | | 248 | 269 | -21 |
| 1983-06-19 | vs SEA | 60 | W 4-2 | 32-28 | 2 | 27,174 | Keith Creel | Matt Young | Bill Castro | Matt Young | Mike Armstrong | 252 | 271 | -19 |
| 1983-06-20 | vs OAK | 61 | L 2-7 | 32-29 | 2 | 30,748 | Vida Blue | Bill Krueger | Bill Krueger | Vida Blue | | 254 | 278 | -24 |
| 1983-06-21 | vs OAK | 62 | W 4-2 | 33-29 | 2 | 17,848 | Paul Splittorff | Steve McCatty | Paul Splittorff | Steve McCatty | Dan Quisenberry | 258 | 280 | -22 |
| 1983-06-22 | vs OAK | 63 | W 7-6 | 34-29 | 1 | 25,601 | Larry Gura | Chris Codiroli | Mike Armstrong | Ben Callahan | | 265 | 286 | -21 |
| 1983-06-23 | vs CAL | 64 | L 2-7 | 34-30 | 2 | 38,823 | Buddy Black | Ken Forsch | Ken Forsch | Buddy Black | | 267 | 293 | -26 |
| 1983-06-24 | vs CAL | 65 | W 11-3 | 35-30 | 1 | 29,370 | Vida Blue | Tommy John | Mike Armstrong | Tommy John | | 278 | 296 | -18 |
| 1983-06-25 | vs CAL | 66 | L 2-9 | 35-31 | 3 | 40,125 | Keith Creel | Mike Witt | Mike Witt | Keith Creel | | 280 | 305 | -25 |
| 1983-06-27 | @ OAK | 67 | L 1-7 | 35-32 | 3 | 21,841 | Larry Gura | Ben Callahan | Ben Callahan | Larry Gura | Chris Codiroli | 281 | 312 | -31 |
| 1983-06-28 | @ OAK | 68 | L 3-4 | 35-33 | 3 | 10,135 | Buddy Black | Tom Underwood | Tom Underwood | Buddy Black | Steve Baker | 284 | 316 | -32 |
| 1983-06-29 | @ OAK | 69 | L 6-11 | 35-34 | 4 | 11,453 | Paul Splittorff | Curt Young | Jeff Jones | Steve Renko | | 290 | 327 | -37 |
| 1983-06-30 | @ OAK | 70 | W 7-4 | 36-34 | 4 | 16,048 | Keith Creel | Steve McCatty | Don Hood | Tom Burgmeier | Dan Quisenberry | 297 | 331 | -34 |
| 1983-07-01 | @ CAL | 71 | L 6-7 | 36-35 | 4 | 34,428 | Vida Blue | Byron McLaughlin | Byron McLaughlin | Vida Blue | Luis Sanchez | 303 | 338 | -35 |
| 1983-07-02 | @ CAL | 72 | W 5-3 | 37-35 | 4 | 39,382 | Larry Gura | Bruce Kison | Larry Gura | Bruce Kison | Dan Quisenberry | 308 | 341 | -33 |
| 1983-07-03 | @ CAL | 73 | L 2-5 | 37-36 | 4 | 36,405 | Buddy Black | Ken Forsch | Ken Forsch | Buddy Black | | 310 | 346 | -36 |
| 1983-07-04 | @ CAL | 74 | W 5-1 | 38-36 | 4 | 63,132 | Paul Splittorff | Tommy John | Paul Splittorff | Tommy John | | 315 | 347 | -32 |
| 1983-07-08 | vs NYA | 75 | L 2-9 | 38-37 | 4 | 39,625 | Larry Gura | Shane Rawley | Shane Rawley | Larry Gura | | 317 | 356 | -39 |
| 1983-07-09 | vs NYA | 76 | W 3-2 | 39-37 | 4 | 40,306 | Buddy Black | Dave Righetti | Dan Quisenberry | Rich Gossage | | 320 | 358 | -38 |
| 1983-07-10 | vs NYA | 77 | L 4-6 | 39-38 | 4 | 37,565 | Paul Splittorff | Ray Fontenot | Ray Fontenot | Paul Splittorff | Rich Gossage | 324 | 364 | -40 |
| 1983-07-11 | vs TOR | 78 | L 4-7 | 39-39 | 4 | 32,415 | Gaylord Perry | Jim Gott | Randy Moffitt | Keith Creel | | 328 | 371 | -43 |
| 1983-07-12 | vs TOR | 79 | L 6-9 | 39-40 | 4 | 22,266 | Vida Blue | Doyle Alexander | Roy Lee Jackson | Steve Renko | | 334 | 380 | -46 |
| 1983-07-13 | vs TOR | 80 | W 5-4 | 40-40 | 4 | 32,352 | Larry Gura | Jim Clancy | Larry Gura | Jim Clancy | Dan Quisenberry | 339 | 384 | -45 |
| 1983-07-14 | @ CLE | 81 | L 3-4 | 40-41 | 4 | 11,013 | Buddy Black | Rick Sutcliffe | Rick Sutcliffe | Mike Armstrong | | 342 | 388 | -46 |
| 1983-07-15 | @ CLE | 82 | W 10-0 | 41-41 | 4 | 10,169 | Paul Splittorff | Juan Eichelberger | Paul Splittorff | Juan Eichelberger | | 352 | 388 | -36 |
| 1983-07-16 | @ CLE | 83 | L 3-17 | 41-42 | 4 | 10,086 | Gaylord Perry | Len Barker | Len Barker | Gaylord Perry | Neal Heaton | 355 | 405 | -50 |
| 1983-07-17 | @ CLE | 84 | W 7-2 | 42-42 | 4 | 20,907 | Steve Renko | Lary Sorensen | Don Hood | Dan Spillner | | 362 | 407 | -45 |
| 1983-07-18 | @ TOR | 85 | L 2-8 | 42-43 | 4 | 26,178 | Larry Gura | Jim Clancy | Jim Clancy | Larry Gura | | 364 | 415 | -51 |
| 1983-07-19 | @ TOR | 86 | W 6-2 | 43-43 | 4 | 36,459 | Buddy Black | Luis Leal | Buddy Black | Luis Leal | Dan Quisenberry | 370 | 417 | -47 |
| 1983-07-20 | @ TOR | 87 | W 14-8 | 44-43 | 2 | 30,658 | Paul Splittorff | Dave Stieb | Paul Splittorff | Dave Stieb | Dan Quisenberry | 384 | 425 | -41 |
| 1983-07-22 | @ NYA | 88 | L 6-7 | 45-44 | 2 | 0 | Gaylord Perry | Ray Fontenot | Rich Gossage | Mike Armstrong | | 390 | 432 | -42 |
| 1983-07-22 | @ NYA | 89 | W 3-2 | 45-44 | 2 | 40,365 | Vida Blue | Matt Keough | Dan Quisenberry | George Frazier | Steve Renko | 393 | 434 | -41 |
| 1983-07-23 | @ NYA | 90 | L 1-5 | 45-45 | 2 | 42,291 | Larry Gura | Ron Guidry | Ron Guidry | Larry Gura | | 394 | 439 | -45 |
| 1983-07-24 | @ NYA | 91 | W 5-4 | 46-45 | 2 | 33,944 | Buddy Black | Shane Rawley | Mike Armstrong | Rich Gossage | Dan Quisenberry | 399 | 443 | -44 |
| 1983-07-25 | vs CLE | 92 | W 6-1 | 47-45 | 2 | 37,652 | Paul Splittorff | Neal Heaton | Paul Splittorff | Neal Heaton | Dan Quisenberry | 405 | 444 | -39 |
| 1983-07-26 | vs CLE | 93 | L 0-2 | 47-46 | 2 | 25,243 | Steve Renko | Lary Sorensen | Lary Sorensen | Steve Renko | | 405 | 446 | -41 |
| 1983-07-27 | vs CLE | 94 | W 5-4 | 48-46 | 2 | 23,457 | Gaylord Perry | Len Barker | Gaylord Perry | Len Barker | Dan Quisenberry | 410 | 450 | -40 |
| 1983-07-29 | @ DET | 95 | L 1-10 | 48-47 | 2 | 39,357 | Larry Gura | Jack Morris | Jack Morris | Larry Gura | | 411 | 460 | -49 |
| 1983-07-30 | @ DET | 96 | L 1-4 | 48-48 | 2 | 35,100 | Buddy Black | Juan Berenguer | Juan Berenguer | Buddy Black | Aurelio Lopez | 412 | 464 | -52 |
| 1983-07-31 | @ DET | 97 | L 6-8 | 49-49 | 2 | 0 | Paul Splittorff | Dave Rozema | Dave Rozema | Paul Splittorff | Aurelio Lopez | 418 | 472 | -54 |
| 1983-07-31 | @ DET | 98 | W 7-5 | 49-49 | 2 | 44,366 | Vida Blue | Howard Bailey | Mike Armstrong | Howard Bailey | Dan Quisenberry | 425 | 477 | -52 |
| 1983-08-01 | @ DET | 99 | L 2-3 | 49-50 | 2 | 37,961 | Steve Renko | Larry Pashnick | Aurelio Lopez | Don Hood | | 427 | 480 | -53 |
| 1983-08-02 | @ MIL | 100 | L 1-5 | 49-52 | 2 | 0 | Gaylord Perry | Bob Gibson | Bob Gibson | Gaylord Perry | | 428 | 485 | -57 |
| 1983-08-02 | @ MIL | 101 | L 2-3 | 49-52 | 2 | 40,808 | Larry Gura | Mike Caldwell | Mike Caldwell | Larry Gura | | 430 | 488 | -58 |
| 1983-08-03 | @ MIL | 102 | W 8-5 | 50-52 | 2 | 25,182 | Keith Creel | Bob McClure | Keith Creel | Bob McClure | Dan Quisenberry | 438 | 493 | -55 |
| 1983-08-04 | @ MIL | 103 | W 6-2 | 51-52 | 2 | 37,191 | Buddy Black | Don Sutton | Buddy Black | Don Sutton | | 444 | 495 | -51 |
| 1983-08-05 | vs BOS | 104 | L 4-5 | 51-53 | 2 | 34,599 | Paul Splittorff | Bruce Hurst | Bruce Hurst | Mike Armstrong | Bob Stanley | 448 | 500 | -52 |
| 1983-08-06 | vs BOS | 105 | W 4-0 | 52-53 | 2 | 40,345 | Eric Rasmussen | Bob Ojeda | Eric Rasmussen | Bob Ojeda | | 452 | 500 | -48 |
| 1983-08-07 | vs BOS | 106 | W 1-0 | 53-53 | 2 | 32,514 | Gaylord Perry | Oil Can Boyd | Gaylord Perry | Oil Can Boyd | Dan Quisenberry | 453 | 500 | -47 |
| 1983-08-08 | vs MIL | 107 | W 5-4 | 54-54 | 2 | 0 | Larry Gura | Bob Gibson | Larry Gura | Jim Slaton | Dan Quisenberry | 458 | 504 | -46 |
| 1983-08-08 | vs MIL | 108 | L 5-8 | 54-54 | 2 | 42,039 | Steve Renko | Bob McClure | Bob McClure | Steve Renko | Pete Ladd | 463 | 512 | -49 |
| 1983-08-09 | vs MIL | 109 | W 8-2 | 55-54 | 2 | 26,635 | Buddy Black | Don Sutton | Buddy Black | Don Sutton | | 471 | 514 | -43 |
| 1983-08-10 | vs MIL | 110 | L 0-4 | 55-55 | 2 | 25,211 | Paul Splittorff | Moose Haas | Moose Haas | Paul Splittorff | | 471 | 518 | -47 |
| 1983-08-13 | @ BOS | 111 | W 5-4 | 56-56 | 2 | 0 | Gaylord Perry | Bob Ojeda | Gaylord Perry | Luis Aponte | Dan Quisenberry | 476 | 522 | -46 |
| 1983-08-13 | @ BOS | 112 | L 3-12 | 56-56 | 2 | 33,896 | Eric Rasmussen | Oil Can Boyd | Oil Can Boyd | Eric Rasmussen | | 479 | 534 | -55 |
| 1983-08-14 | @ BOS | 113 | L 3-4 | 57-57 | 2 | 0 | Steve Renko | Dennis Eckersley | Bob Stanley | Steve Renko | | 482 | 538 | -56 |
| 1983-08-14 | @ BOS | 114 | W 6-3 | 57-57 | 2 | 33,514 | Keith Creel | John Tudor | Keith Creel | John Tudor | Dan Quisenberry | 488 | 541 | -53 |
| 1983-08-15 | vs DET | 115 | W 6-4 | 58-57 | 2 | 36,881 | Larry Gura | Larry Pashnick | Larry Gura | Larry Pashnick | Mike Armstrong | 494 | 545 | -51 |
| 1983-08-16 | vs DET | 116 | W 18-7 | 59-57 | 2 | 27,929 | Buddy Black | Dave Rozema | Mark Huismann | Dave Rozema | Dan Quisenberry | 512 | 552 | -40 |
| 1983-08-17 | vs DET | 117 | L 4-10 | 59-58 | 2 | 23,147 | Paul Splittorff | Dan Petry | Dan Petry | Mark Huismann | | 516 | 562 | -46 |
| 1983-08-19 | @ BAL | 118 | L 4-5 | 59-60 | 2 | 0 | Gaylord Perry | Scott McGregor | Sammy Stewart | Dan Quisenberry | | 520 | 567 | -47 |
| 1983-08-19 | @ BAL | 119 | L 1-3 | 59-60 | 2 | 35,582 | Eric Rasmussen | Storm Davis | Tippy Martinez | Eric Rasmussen | | 521 | 570 | -49 |
| 1983-08-20 | @ BAL | 120 | L 1-6 | 59-61 | 2 | 23,069 | Larry Gura | Mike Boddicker | Mike Boddicker | Larry Gura | Tippy Martinez | 522 | 576 | -54 |
| 1983-08-21 | @ BAL | 121 | W 8-3 | 60-61 | 2 | 29,044 | Buddy Black | Jim Palmer | Buddy Black | Jim Palmer | Dan Quisenberry | 530 | 579 | -49 |
| 1983-08-22 | vs CHA | 122 | L 1-3 | 60-62 | 2 | 31,479 | Paul Splittorff | LaMarr Hoyt | LaMarr Hoyt | Paul Splittorff | | 531 | 582 | -51 |
| 1983-08-23 | vs CHA | 123 | W 10-2 | 61-62 | 2 | 18,767 | Steve Renko | Jerry Koosman | Steve Renko | Jerry Koosman | | 541 | 584 | -43 |
| 1983-08-24 | vs CHA | 124 | L 3-4 | 61-63 | 2 | 19,056 | Gaylord Perry | Richard Dotson | Richard Dotson | Dan Quisenberry | Dennis Lamp | 544 | 588 | -44 |
| 1983-08-25 | vs TEX | 125 | W 3-1 | 63-63 | 2 | 0 | Eric Rasmussen | Jon Matlack | Eric Rasmussen | Jon Matlack | Dan Quisenberry | 547 | 589 | -42 |
| 1983-08-25 | vs TEX | 126 | W 5-4 | 63-63 | 2 | 26,206 | Larry Gura | Dave Stewart | Mike Armstrong | Dave J. Schmidt | | 552 | 593 | -41 |
| 1983-08-26 | vs TEX | 127 | W 8-3 | 64-63 | 2 | 34,597 | Buddy Black | John Butcher | Buddy Black | John Butcher | | 560 | 596 | -36 |
| 1983-08-27 | vs TEX | 128 | W 2-0 | 65-63 | 2 | 35,259 | Paul Splittorff | Frank Tanana | Paul Splittorff | Frank Tanana | Dan Quisenberry | 562 | 596 | -34 |
| 1983-08-28 | vs TEX | 129 | L 0-1 | 65-64 | 2 | 29,133 | Steve Renko | Charlie Hough | Charlie Hough | Steve Renko | | 562 | 597 | -35 |
| 1983-08-29 | vs BAL | 130 | L 2-9 | 65-65 | 2 | 20,367 | Gaylord Perry | Scott McGregor | Scott McGregor | Gaylord Perry | | 564 | 606 | -42 |
| 1983-08-30 | vs BAL | 131 | L 4-12 | 65-66 | 2 | 15,769 | Eric Rasmussen | Storm Davis | Storm Davis | Eric Rasmussen | | 568 | 618 | -50 |
| 1983-08-31 | @ CHA | 132 | L 3-7 | 65-67 | 2 | 31,346 | Larry Gura | Floyd Bannister | Floyd Bannister | Larry Gura | | 571 | 625 | -54 |
| 1983-09-01 | @ CHA | 133 | L 0-12 | 65-68 | 2 | 30,852 | Buddy Black | LaMarr Hoyt | LaMarr Hoyt | Buddy Black | | 571 | 637 | -66 |
| 1983-09-02 | @ TEX | 134 | L 0-7 | 65-69 | 2 | 8,515 | Paul Splittorff | Charlie Hough | Charlie Hough | Paul Splittorff | | 571 | 644 | -73 |
| 1983-09-03 | @ TEX | 135 | W 5-0 | 66-70 | 2 | 0 | Gaylord Perry | Danny Darwin | Gaylord Perry | Danny Darwin | | 576 | 644 | -68 |
| 1983-09-03 | @ TEX | 136 | L 1-8 | 66-70 | 2 | 16,297 | Keith Creel | Mike Smithson | Mike Smithson | Keith Creel | | 577 | 652 | -75 |
| 1983-09-04 | @ TEX | 137 | L 2-3 | 66-71 | 2 | 13,872 | Eric Rasmussen | Dave Stewart | Dave Stewart | Eric Rasmussen | Victor Cruz | 579 | 655 | -76 |
| 1983-09-05 | vs SEA | 138 | L 6-13 | 66-72 | 2 | 16,952 | Larry Gura | Jim Beattie | Jim Beattie | Larry Gura | | 585 | 668 | -83 |
| 1983-09-06 | vs SEA | 139 | L 1-3 | 66-73 | 2 | 14,084 | Buddy Black | Bob Stoddard | Bob Stoddard | Buddy Black | Bill Caudill | 586 | 671 | -85 |
| 1983-09-07 | vs SEA | 140 | W 3-2 | 67-73 | 2 | 15,059 | Paul Splittorff | Matt Young | Paul Splittorff | Matt Young | Dan Quisenberry | 589 | 673 | -84 |
| 1983-09-09 | @ MIN | 141 | L 6-7 | 67-74 | 2 | 5,400 | Gaylord Perry | Ken Schrom | Jack O'Connor | Mike Armstrong | | 595 | 680 | -85 |
| 1983-09-10 | @ MIN | 142 | L 3-6 | 67-75 | 2 | 6,354 | Eric Rasmussen | Pete Filson | Pete Filson | Eric Rasmussen | Ron Davis | 598 | 686 | -88 |
| 1983-09-11 | @ MIN | 143 | W 3-1 | 68-75 | 2 | 4,820 | Frank Wills | Jay Pettibone | Danny Jackson | Jay Pettibone | Dan Quisenberry | 601 | 687 | -86 |
| 1983-09-13 | @ CAL | 144 | W 4-3 | 69-75 | 2 | 23,959 | Buddy Black | Luis Sanchez | Buddy Black | Luis Sanchez | Dan Quisenberry | 605 | 690 | -85 |
| 1983-09-14 | @ CAL | 145 | W 1-0 | 70-75 | 2 | 23,284 | Paul Splittorff | Tommy John | Mike Armstrong | Rick Steirer | | 606 | 690 | -84 |
| 1983-09-16 | vs OAK | 146 | W 6-5 | 71-75 | 2 | 20,951 | Gaylord Perry | Chris Codiroli | Larry Gura | Keith Atherton | Dan Quisenberry | 612 | 695 | -83 |
| 1983-09-17 | vs OAK | 147 | W 10-1 | 72-75 | 2 | 22,494 | Eric Rasmussen | Gorman Heimueller | Eric Rasmussen | Gorman Heimueller | Dan Quisenberry | 622 | 696 | -74 |
| 1983-09-18 | vs OAK | 148 | L 2-6 | 72-76 | 2 | 19,862 | Frank Wills | Mike Warren | Mike Warren | Frank Wills | | 624 | 702 | -78 |
| 1983-09-19 | vs CAL | 149 | W 8-4 | 74-76 | 2 | 0 | Buddy Black | Steve Brown | Mike Armstrong | Andy Hassler | | 632 | 706 | -74 |
| 1983-09-19 | vs CAL | 150 | W 7-6 | 74-76 | 2 | 24,576 | Danny Jackson | John Curtis | Mark Huismann | Byron McLaughlin | | 639 | 712 | -73 |
| 1983-09-20 | vs CAL | 151 | L 4-6 | 74-77 | 2 | 15,003 | Paul Splittorff | Tommy John | Tommy John | Paul Splittorff | Mike Witt | 643 | 718 | -75 |
| 1983-09-21 | vs CAL | 152 | L 0-3 | 74-78 | 2 | 14,874 | Gaylord Perry | Geoff Zahn | Geoff Zahn | Gaylord Perry | | 643 | 721 | -78 |
| 1983-09-22 | vs MIN | 153 | L 1-2 | 74-79 | 2 | 15,684 | Eric Rasmussen | Pete Filson | Pete Filson | Eric Rasmussen | Ron Davis | 644 | 723 | -79 |
| 1983-09-23 | vs MIN | 154 | W 3-2 | 75-79 | 2 | 18,313 | Frank Wills | Jay Pettibone | Frank Wills | Jay Pettibone | Dan Quisenberry | 647 | 725 | -78 |
| 1983-09-24 | vs MIN | 155 | W 12-4 | 76-79 | 2 | 17,407 | Buddy Black | Frank Viola | Buddy Black | Frank Viola | | 659 | 729 | -70 |
| 1983-09-25 | vs MIN | 156 | L 1-7 | 76-80 | 2 | 22,695 | Danny Jackson | Ken Schrom | Ken Schrom | Danny Jackson | | 660 | 736 | -76 |
| 1983-09-26 | @ SEA | 157 | W 6-2 | 77-80 | 2 | 3,864 | Paul Splittorff | Bryan Clark | Paul Splittorff | Bryan Clark | Dan Quisenberry | 666 | 738 | -72 |
| 1983-09-27 | @ SEA | 158 | L 0-4 | 77-81 | 2 | 7,956 | Larry Gura | Jim Beattie | Jim Beattie | Larry Gura | | 666 | 742 | -76 |
| 1983-09-28 | @ SEA | 159 | W 11-8 | 78-81 | 2 | 3,630 | Frank Wills | Gene Nelson | Frank Wills | Gene Nelson | | 677 | 750 | -73 |
| 1983-09-29 | @ SEA | 160 | L 4-5 | 78-82 | 2 | 3,694 | Buddy Black | Mike Moore | Mike Stanton | Buddy Black | Bill Caudill | 681 | 755 | -74 |
| 1983-10-01 | @ OAK | 161 | W 4-1 | 80-82 | 2 | 0 | Paul Splittorff | Steve McCatty | Paul Splittorff | Steve McCatty | Dan Quisenberry | 685 | 756 | -71 |
| 1983-10-01 | @ OAK | 162 | W 7-3 | 80-82 | 2 | 11,346 | Danny Jackson | Gorman Heimueller | Mike Armstrong | Jeff Jones | Dan Quisenberry | 692 | 759 | -67 |
| 1983-10-02 | @ OAK | 163 | L 4-8 | 80-83 | 2 | 23,699 | Keith Creel | Ed Farmer | Mark Smith | Don Hood | | 696 | 767 | -71 |