| 1983-04-05 | @ BOS | 1 | W 7-1 | 1-0 | 3 | 33,852 | Dave Stieb | Dennis Eckersley | Dave Stieb | Dennis Eckersley | Roy Lee Jackson | 7 | 1 | 6 |
| 1983-04-07 | @ BOS | 2 | L 4-7 | 1-1 | 5 | 9,603 | Luis Leal | John Tudor | Bob Stanley | Luis Leal | | 11 | 8 | 3 |
| 1983-04-09 | vs NYA | 3 | W 7-4 | 2-1 | 2 | 36,459 | Jim Gott | Doyle Alexander | Roy Lee Jackson | Rich Gossage | | 18 | 12 | 6 |
| 1983-04-10 | vs NYA | 4 | L 0-3 | 2-2 | 3 | 23,093 | Dave Stieb | Shane Rawley | Shane Rawley | Dave Stieb | | 18 | 15 | 3 |
| 1983-04-12 | vs MIL | 5 | L 5-6 | 2-3 | 5 | 11,413 | Luis Leal | Don Sutton | Don Sutton | Mike Morgan | Jamie Easterly | 23 | 21 | 2 |
| 1983-04-13 | vs MIL | 6 | W 7-2 | 3-3 | 4 | 10,809 | Jim Clancy | Mike Caldwell | Jim Clancy | Mike Caldwell | | 30 | 23 | 7 |
| 1983-04-14 | vs MIL | 7 | L 4-5 | 3-4 | 5 | 10,127 | Jim Gott | Jerry Augustine | Jim Slaton | Joey McLaughlin | | 34 | 28 | 6 |
| 1983-04-15 | @ NYA | 8 | W 6-5 | 4-4 | 4 | 15,092 | Dave Stieb | Doyle Alexander | Dave Stieb | Rudy May | | 40 | 33 | 7 |
| 1983-04-17 | @ NYA | 9 | L 5-7 | 4-5 | 6 | 50,200 | Jim Clancy | Shane Rawley | Shane Rawley | Jim Clancy | | 45 | 40 | 5 |
| 1983-04-18 | @ NYA | 10 | L 0-3 | 4-6 | 7 | 11,148 | Luis Leal | Ron Guidry | Ron Guidry | Luis Leal | | 45 | 43 | 2 |
| 1983-04-19 | vs CLE | 11 | W 9-7 | 5-6 | 4 | 10,358 | Jim Gott | Rick Sutcliffe | Randy Moffitt | Dan Spillner | | 54 | 50 | 4 |
| 1983-04-20 | vs CLE | 12 | W 4-1 | 6-6 | 3 | 10,173 | Dave Stieb | Lary Sorensen | Dave Stieb | Lary Sorensen | | 58 | 51 | 7 |
| 1983-04-22 | @ KCA | 13 | L 5-6 | 6-7 | 5 | 16,172 | Mike Morgan | Dennis Leonard | Dennis Leonard | Roy Lee Jackson | Dan Quisenberry | 63 | 57 | 6 |
| 1983-04-23 | @ KCA | 14 | W 5-4 | 7-7 | 5 | 19,906 | Luis Leal | Vida Blue | Randy Moffitt | Dan Quisenberry | Joey McLaughlin | 68 | 61 | 7 |
| 1983-04-24 | @ KCA | 15 | L 1-7 | 7-8 | 6 | 18,522 | Jim Gott | Steve Renko | Steve Renko | Jim Gott | | 69 | 68 | 1 |
| 1983-04-26 | @ TEX | 16 | L 1-2 | 7-9 | 7 | 17,380 | Dave Stieb | Mike Smithson | Mike Smithson | Dave Stieb | | 70 | 70 | 0 |
| 1983-04-27 | @ TEX | 17 | W 3-2 | 8-9 | 6 | 7,518 | Jim Clancy | Danny Darwin | Randy Moffitt | Danny Darwin | | 73 | 72 | 1 |
| 1983-04-29 | vs CHA | 18 | L 3-9 | 8-10 | 6 | 13,212 | Luis Leal | Richard Dotson | Richard Dotson | Luis Leal | Dick Tidrow | 76 | 81 | -5 |
| 1983-05-01 | vs CHA | 19 | W 8-0 | 9-10 | 6 | 18,769 | Dave Stieb | Floyd Bannister | Dave Stieb | Floyd Bannister | | 84 | 81 | 3 |
| 1983-05-02 | vs TEX | 20 | W 6-5 | 10-10 | 4 | 10,525 | Jim Clancy | Danny Darwin | Jim Clancy | Danny Darwin | Randy Moffitt | 90 | 86 | 4 |
| 1983-05-03 | vs TEX | 21 | L 2-7 | 10-11 | 5 | 10,125 | Jim Gott | Jon Matlack | Jon Matlack | Jim Gott | Dave Tobik | 92 | 93 | -1 |
| 1983-05-04 | vs TEX | 22 | W 7-1 | 11-11 | 5 | 11,280 | Luis Leal | Rick Honeycutt | Luis Leal | Rick Honeycutt | | 99 | 94 | 5 |
| 1983-05-06 | vs KCA | 23 | W 6-1 | 12-11 | 3 | 12,699 | Dave Stieb | Larry Gura | Dave Stieb | Larry Gura | | 105 | 95 | 10 |
| 1983-05-07 | vs KCA | 24 | W 7-4 | 13-11 | 3 | 15,527 | Jim Clancy | Dennis Leonard | Roy Lee Jackson | Dennis Leonard | Randy Moffitt | 112 | 99 | 13 |
| 1983-05-08 | vs KCA | 25 | L 1-6 | 13-12 | 4 | 25,753 | Jim Gott | Steve Renko | Steve Renko | Jim Gott | Dan Quisenberry | 113 | 105 | 8 |
| 1983-05-09 | @ CHA | 26 | W 6-1 | 14-12 | 3 | 9,848 | Luis Leal | Britt Burns | Luis Leal | Britt Burns | | 119 | 106 | 13 |
| 1983-05-11 | @ CHA | 27 | W 3-1 | 15-12 | 4 | 18,844 | Dave Stieb | LaMarr Hoyt | Dave Stieb | LaMarr Hoyt | | 122 | 107 | 15 |
| 1983-05-12 | @ CLE | 28 | W 6-3 | 16-12 | 3 | 6,361 | Jim Clancy | Lary Sorensen | Jim Clancy | Lary Sorensen | Randy Moffitt | 128 | 110 | 18 |
| 1983-05-13 | @ CLE | 29 | L 1-5 | 16-13 | 3 | 10,900 | Mike Morgan | Juan Eichelberger | Juan Eichelberger | Mike Morgan | | 129 | 115 | 14 |
| 1983-05-14 | @ CLE | 30 | W 8-1 | 17-13 | 3 | 15,505 | Luis Leal | Bert Blyleven | Luis Leal | Bert Blyleven | Roy Lee Jackson | 137 | 116 | 21 |
| 1983-05-16 | @ MIL | 31 | W 2-1 | 18-13 | 3 | 8,298 | Dave Stieb | Bob McClure | Dave Stieb | Bob McClure | Randy Moffitt | 139 | 117 | 22 |
| 1983-05-17 | @ MIL | 32 | L 6-9 | 18-14 | 3 | 9,304 | Jim Clancy | Mike Caldwell | Mike Caldwell | Jim Clancy | Tom Tellmann | 145 | 126 | 19 |
| 1983-05-18 | @ MIL | 33 | L 6-7 | 18-15 | 4 | 16,485 | Luis Leal | Don Sutton | Jim Slaton | Dave Geisel | | 151 | 133 | 18 |
| 1983-05-19 | vs BAL | 34 | L 1-2 | 18-16 | 4 | 11,569 | Mike Morgan | Scott McGregor | Scott McGregor | Mike Morgan | Tippy Martinez | 152 | 135 | 17 |
| 1983-05-20 | vs BAL | 35 | W 7-5 | 19-16 | 4 | 16,034 | Jim Gott | Dennis Martinez | Jim Gott | Dennis Martinez | Joey McLaughlin | 159 | 140 | 19 |
| 1983-05-21 | vs BAL | 36 | W 6-0 | 20-16 | 3 | 20,165 | Dave Stieb | Sammy Stewart | Dave Stieb | Sammy Stewart | | 165 | 140 | 25 |
| 1983-05-22 | vs BAL | 37 | W 5-0 | 21-16 | 3 | 15,222 | Jim Clancy | Mike Boddicker | Jim Clancy | Mike Boddicker | | 170 | 140 | 30 |
| 1983-05-23 | vs DET | 38 | W 4-0 | 22-16 | 2 | 35,011 | Luis Leal | Milt Wilcox | Luis Leal | Milt Wilcox | Randy Moffitt | 174 | 140 | 34 |
| 1983-05-24 | vs DET | 39 | W 7-6 | 23-16 | 1 | 19,105 | Mike Morgan | Jerry Ujdur | Roy Lee Jackson | Dave Rucker | Joey McLaughlin | 181 | 146 | 35 |
| 1983-05-25 | vs DET | 40 | L 2-6 | 23-17 | 2 | 15,846 | Jim Gott | Dan Petry | Dan Petry | Jim Gott | Aurelio Lopez | 183 | 152 | 31 |
| 1983-05-26 | vs BOS | 41 | L 2-7 | 23-18 | 2 | 16,589 | Dave Stieb | Bob Ojeda | Bob Stanley | Dave Stieb | | 185 | 159 | 26 |
| 1983-05-27 | vs BOS | 42 | L 0-2 | 23-19 | 2 | 17,161 | Jim Clancy | John Tudor | John Tudor | Jim Clancy | | 185 | 161 | 24 |
| 1983-05-28 | vs BOS | 43 | W 9-5 | 24-19 | 2 | 30,171 | Luis Leal | Mike Brown | Roy Lee Jackson | Luis Aponte | Joey McLaughlin | 194 | 166 | 28 |
| 1983-05-29 | vs BOS | 44 | W 6-1 | 25-19 | 2 | 33,352 | Jim Gott | Dennis Eckersley | Jim Gott | Dennis Eckersley | | 200 | 167 | 33 |
| 1983-05-30 | @ DET | 45 | W 6-4 | 26-19 | 1 | 10,901 | Dave Stieb | Dan Petry | Joey McLaughlin | Dave Gumpert | | 206 | 171 | 35 |
| 1983-06-01 | @ DET | 46 | L 1-3 | 26-20 | 1 | 9,586 | Jim Clancy | Dave Rozema | Dave Rozema | Jim Clancy | Aurelio Lopez | 207 | 174 | 33 |
| 1983-06-02 | @ DET | 47 | W 6-1 | 27-20 | 1 | 11,907 | Luis Leal | Milt Wilcox | Luis Leal | Milt Wilcox | | 213 | 175 | 38 |
| 1983-06-03 | @ BAL | 48 | L 2-3 | 27-21 | 2 | 40,393 | Jim Gott | Dennis Martinez | Tippy Martinez | Joey McLaughlin | | 215 | 178 | 37 |
| 1983-06-04 | @ BAL | 49 | L 4-6 | 27-22 | 3 | 22,659 | Dave Stieb | Mike Boddicker | Mike Boddicker | Dave Stieb | Sammy Stewart | 219 | 184 | 35 |
| 1983-06-05 | @ BAL | 50 | W 5-2 | 28-22 | 2 | 20,953 | Jim Clancy | Storm Davis | Jim Clancy | Storm Davis | Joey McLaughlin | 224 | 186 | 38 |
| 1983-06-06 | @ BAL | 51 | L 1-8 | 28-23 | 3 | 16,649 | Luis Leal | Scott McGregor | Scott McGregor | Luis Leal | | 225 | 194 | 31 |
| 1983-06-07 | @ OAK | 52 | L 3-5 | 28-24 | 3 | 8,353 | Jim Gott | Mike Norris | Tim Conroy | Jim Gott | Steve Baker | 228 | 199 | 29 |
| 1983-06-08 | @ OAK | 53 | W 5-2 | 29-24 | 2 | 11,229 | Dave Stieb | Chris Codiroli | Dave Stieb | Chris Codiroli | Joey McLaughlin | 233 | 201 | 32 |
| 1983-06-09 | @ OAK | 54 | L 1-3 | 29-25 | 3 | 6,846 | Jim Clancy | Tom Underwood | Tom Underwood | Jim Clancy | Steve Baker | 234 | 204 | 30 |
| 1983-06-10 | @ CAL | 55 | L 3-5 | 29-26 | 4 | 32,751 | Luis Leal | Bill Travers | Curt Brown | Luis Leal | | 237 | 209 | 28 |
| 1983-06-11 | @ CAL | 56 | W 3-2 | 30-26 | 3 | 45,393 | Jim Gott | Dave Goltz | Jim Gott | Dave Goltz | Randy Moffitt | 240 | 211 | 29 |
| 1983-06-12 | @ CAL | 57 | W 6-5 | 31-26 | 3 | 32,587 | Dave Stieb | Byron McLaughlin | Stan Clarke | Curt Brown | Dave Geisel | 246 | 216 | 30 |
| 1983-06-14 | vs OAK | 58 | W 13-7 | 32-26 | 2 | 20,189 | Jim Clancy | Tom Underwood | Roy Lee Jackson | Tom Underwood | | 259 | 223 | 36 |
| 1983-06-15 | vs OAK | 59 | L 1-10 | 32-27 | 3 | 20,039 | Luis Leal | Bill Krueger | Bill Krueger | Luis Leal | | 260 | 233 | 27 |
| 1983-06-16 | vs OAK | 60 | W 9-1 | 33-27 | 3 | 18,186 | Jim Gott | Steve McCatty | Jim Gott | Steve McCatty | | 269 | 234 | 35 |
| 1983-06-17 | vs CAL | 61 | W 6-3 | 34-27 | 3 | 31,586 | Dave Stieb | Bill Travers | Dave Stieb | Bill Travers | | 275 | 237 | 38 |
| 1983-06-18 | vs CAL | 62 | L 6-7 | 34-28 | 3 | 40,150 | Jim Clancy | Ken Forsch | Luis Sanchez | Stan Clarke | | 281 | 244 | 37 |
| 1983-06-19 | vs CAL | 63 | W 6-1 | 35-28 | 2 | 36,098 | Luis Leal | Dave Goltz | Luis Leal | Dave Goltz | | 287 | 245 | 42 |
| 1983-06-20 | vs MIN | 64 | W 2-1 | 36-28 | 2 | 19,267 | Jim Gott | Frank Viola | Jim Gott | Ron Davis | | 289 | 246 | 43 |
| 1983-06-21 | vs MIN | 65 | W 8-3 | 37-28 | 2 | 23,473 | Jim Acker | Bryan Oelkers | Jim Acker | Bryan Oelkers | | 297 | 249 | 48 |
| 1983-06-22 | vs MIN | 66 | L 3-4 | 37-29 | 2 | 26,452 | Dave Stieb | Ken Schrom | Ken Schrom | Dave Stieb | Ron Davis | 300 | 253 | 47 |
| 1983-06-23 | @ SEA | 67 | W 5-4 | 38-29 | 2 | 6,303 | Jim Clancy | Glenn Abbott | Jim Clancy | Mike Stanton | Joey McLaughlin | 305 | 257 | 48 |
| 1983-06-24 | @ SEA | 68 | W 4-2 | 39-29 | 2 | 6,389 | Luis Leal | Matt Young | Luis Leal | Matt Young | | 309 | 259 | 50 |
| 1983-06-25 | @ SEA | 69 | L 2-5 | 39-30 | 3 | 15,048 | Jim Gott | Jim Beattie | Jim Beattie | Jim Gott | Bill Caudill | 311 | 264 | 47 |
| 1983-06-26 | @ SEA | 70 | W 19-7 | 40-30 | 2 | 6,593 | Jim Acker | Bob Stoddard | Jim Acker | Bob Stoddard | | 330 | 271 | 59 |
| 1983-06-28 | @ MIN | 71 | L 2-5 | 40-31 | 3 | 12,844 | Dave Stieb | Ken Schrom | Ken Schrom | Dave Stieb | Ron Davis | 332 | 276 | 56 |
| 1983-06-29 | @ MIN | 72 | W 4-2 | 41-31 | 1 | 8,242 | Jim Clancy | Bobby Castillo | Jim Clancy | Bobby Castillo | | 336 | 278 | 58 |
| 1983-06-30 | @ MIN | 73 | W 11-3 | 42-31 | 1 | 20,498 | Luis Leal | Albert Williams | Luis Leal | Albert Williams | | 347 | 281 | 66 |
| 1983-07-01 | vs SEA | 74 | L 2-11 | 42-32 | 1 | 36,572 | Jim Gott | Jim Beattie | Jim Beattie | Jim Gott | | 349 | 292 | 57 |
| 1983-07-02 | vs SEA | 75 | W 7-6 | 43-32 | 1 | 21,783 | Jim Acker | Mike Moore | Roy Lee Jackson | Bill Caudill | | 356 | 298 | 58 |
| 1983-07-03 | vs SEA | 76 | L 1-4 | 43-33 | 1 | 32,161 | Dave Stieb | Glenn Abbott | Glenn Abbott | Dave Stieb | | 357 | 302 | 55 |
| 1983-07-08 | vs TEX | 77 | W 8-5 | 44-33 | 1 | 25,666 | Jim Clancy | Danny Darwin | Jim Clancy | Danny Darwin | Randy Moffitt | 365 | 307 | 58 |
| 1983-07-09 | vs TEX | 78 | W 5-1 | 45-33 | 1 | 26,234 | Luis Leal | Charlie Hough | Luis Leal | Charlie Hough | | 370 | 308 | 62 |
| 1983-07-10 | vs TEX | 79 | W 6-4 | 46-33 | 1 | 32,071 | Dave Stieb | Rick Honeycutt | Dave Stieb | Rick Honeycutt | Randy Moffitt | 376 | 312 | 64 |
| 1983-07-11 | @ KCA | 80 | W 7-4 | 47-33 | 1 | 32,415 | Jim Gott | Gaylord Perry | Randy Moffitt | Keith Creel | | 383 | 316 | 67 |
| 1983-07-12 | @ KCA | 81 | W 9-6 | 48-33 | 1 | 22,266 | Doyle Alexander | Vida Blue | Roy Lee Jackson | Steve Renko | | 392 | 322 | 70 |
| 1983-07-13 | @ KCA | 82 | L 4-5 | 48-34 | 1 | 32,352 | Jim Clancy | Larry Gura | Larry Gura | Jim Clancy | Dan Quisenberry | 396 | 327 | 69 |
| 1983-07-14 | @ CHA | 83 | W 8-0 | 49-34 | 1 | 17,883 | Luis Leal | Jerry Koosman | Luis Leal | Jerry Koosman | | 404 | 327 | 77 |
| 1983-07-15 | @ CHA | 84 | W 3-2 | 50-34 | 1 | 28,288 | Dave Stieb | Richard Dotson | Joey McLaughlin | Richard Dotson | | 407 | 329 | 78 |
| 1983-07-16 | @ CHA | 85 | W 7-5 | 51-34 | 1 | 34,243 | Jim Gott | Britt Burns | Joey McLaughlin | Juan Agosto | Randy Moffitt | 414 | 334 | 80 |
| 1983-07-17 | @ CHA | 86 | L 2-3 | 51-35 | 1 | 30,140 | Doyle Alexander | Floyd Bannister | Floyd Bannister | Doyle Alexander | Dennis Lamp | 416 | 337 | 79 |
| 1983-07-18 | vs KCA | 87 | W 8-2 | 52-35 | 1 | 26,178 | Jim Clancy | Larry Gura | Jim Clancy | Larry Gura | | 424 | 339 | 85 |
| 1983-07-19 | vs KCA | 88 | L 2-6 | 52-36 | 1 | 36,459 | Luis Leal | Buddy Black | Buddy Black | Luis Leal | Dan Quisenberry | 426 | 345 | 81 |
| 1983-07-20 | vs KCA | 89 | L 8-14 | 52-37 | 2 | 30,658 | Dave Stieb | Paul Splittorff | Paul Splittorff | Dave Stieb | Dan Quisenberry | 434 | 359 | 75 |
| 1983-07-21 | @ TEX | 90 | L 2-3 | 52-38 | 2 | 18,323 | Jim Gott | Frank Tanana | Frank Tanana | Jim Gott | | 436 | 362 | 74 |
| 1983-07-22 | @ TEX | 91 | W 10-5 | 53-38 | 1 | 28,075 | Doyle Alexander | Charlie Hough | Randy Moffitt | Dave J. Schmidt | | 446 | 367 | 79 |
| 1983-07-23 | @ TEX | 92 | W 3-2 | 54-38 | 1 | 43,705 | Jim Clancy | Danny Darwin | Jim Clancy | Danny Darwin | | 449 | 369 | 80 |
| 1983-07-24 | @ TEX | 93 | L 0-3 | 54-39 | 2 | 30,123 | Luis Leal | Rick Honeycutt | Rick Honeycutt | Luis Leal | | 449 | 372 | 77 |
| 1983-07-25 | vs CHA | 94 | L 4-7 | 54-40 | 3 | 24,394 | Dave Stieb | Richard Dotson | Richard Dotson | Dave Stieb | Dennis Lamp | 453 | 379 | 74 |
| 1983-07-26 | vs CHA | 95 | W 6-4 | 55-41 | 3 | 0 | Jim Gott | Britt Burns | Jim Gott | Britt Burns | Joey McLaughlin | 459 | 383 | 76 |
| 1983-07-26 | vs CHA | 96 | L 3-4 | 55-41 | 3 | 33,554 | Doyle Alexander | Floyd Bannister | Floyd Bannister | Doyle Alexander | Dennis Lamp | 462 | 387 | 75 |
| 1983-07-27 | vs CHA | 97 | L 3-11 | 55-42 | 4 | 36,012 | Luis Leal | LaMarr Hoyt | LaMarr Hoyt | Luis Leal | | 465 | 398 | 67 |
| 1983-07-29 | vs CLE | 98 | W 4-2 | 56-42 | 3 | 18,020 | Jim Clancy | Rick Sutcliffe | Jim Clancy | Rick Sutcliffe | | 469 | 400 | 69 |
| 1983-07-30 | vs CLE | 99 | W 6-5 | 57-42 | 3 | 23,445 | Dave Stieb | Neal Heaton | Joey McLaughlin | Bud Anderson | | 475 | 405 | 70 |
| 1983-07-31 | vs CLE | 100 | L 11-16 | 57-43 | 3 | 22,498 | Jim Gott | Lary Sorensen | Juan Eichelberger | Jim Acker | Bud Anderson | 486 | 421 | 65 |
| 1983-08-01 | vs CLE | 101 | L 0-6 | 57-44 | 3 | 20,781 | Doyle Alexander | Len Barker | Len Barker | Doyle Alexander | | 486 | 427 | 59 |
| 1983-08-02 | vs NYA | 102 | W 10-9 | 59-44 | 3 | 0 | Luis Leal | Matt Keough | Roy Lee Jackson | Dale Murray | | 496 | 436 | 60 |
| 1983-08-02 | vs NYA | 103 | W 13-6 | 59-44 | 3 | 45,102 | Matt Williams | Bob Shirley | Matt Williams | Bob Shirley | Dave Geisel | 509 | 442 | 67 |
| 1983-08-03 | vs NYA | 104 | W 6-2 | 60-44 | 3 | 35,589 | Jim Clancy | Ron Guidry | Jim Clancy | Ron Guidry | | 515 | 444 | 71 |
| 1983-08-04 | vs NYA | 105 | L 1-3 | 60-45 | 3 | 36,684 | Dave Stieb | Shane Rawley | Shane Rawley | Dave Stieb | | 516 | 447 | 69 |
| 1983-08-05 | @ MIL | 106 | L 0-7 | 60-46 | 3 | 29,559 | Jim Gott | Moose Haas | Moose Haas | Jim Gott | | 516 | 454 | 62 |
| 1983-08-06 | @ MIL | 107 | L 0-3 | 60-47 | 4 | 48,464 | Doyle Alexander | Chuck Porter | Chuck Porter | Doyle Alexander | | 516 | 457 | 59 |
| 1983-08-07 | @ MIL | 108 | L 6-9 | 60-48 | 4 | 47,300 | Luis Leal | Mike Caldwell | Mike Caldwell | Luis Leal | Pete Ladd | 522 | 466 | 56 |
| 1983-08-08 | @ NYA | 109 | L 3-8 | 60-50 | 5 | 0 | Jim Clancy | Ron Guidry | Ron Guidry | Jim Clancy | | 525 | 474 | 51 |
| 1983-08-08 | @ NYA | 110 | L 3-11 | 60-50 | 5 | 40,598 | Matt Williams | Bob Shirley | Bob Shirley | Matt Williams | George Frazier | 528 | 485 | 43 |
| 1983-08-09 | @ NYA | 111 | W 8-0 | 61-50 | 5 | 35,221 | Dave Stieb | Shane Rawley | Dave Stieb | Shane Rawley | | 536 | 485 | 51 |
| 1983-08-10 | @ NYA | 112 | L 3-8 | 61-51 | 5 | 40,377 | Jim Gott | Dave Righetti | Dave Righetti | Jim Gott | | 539 | 493 | 46 |
| 1983-08-11 | vs MIL | 113 | L 4-6 | 61-52 | 5 | 27,620 | Doyle Alexander | Chuck Porter | Chuck Porter | Doyle Alexander | Pete Ladd | 543 | 499 | 44 |
| 1983-08-12 | vs MIL | 114 | W 5-4 | 62-52 | 5 | 30,130 | Luis Leal | Mike Caldwell | Joey McLaughlin | Jim Slaton | | 548 | 503 | 45 |
| 1983-08-13 | vs MIL | 115 | W 3-1 | 63-52 | 5 | 35,240 | Jim Clancy | Bob McClure | Jim Clancy | Bob McClure | Dave Geisel | 551 | 504 | 47 |
| 1983-08-14 | vs MIL | 116 | W 4-3 | 64-52 | 5 | 42,240 | Dave Stieb | Bob Gibson | Dave Stieb | Pete Ladd | Joey McLaughlin | 555 | 507 | 48 |
| 1983-08-15 | @ CLE | 117 | W 3-2 | 65-52 | 4 | 6,675 | Jim Gott | Lary Sorensen | Randy Moffitt | Dan Spillner | | 558 | 509 | 49 |
| 1983-08-16 | @ CLE | 118 | L 2-3 | 66-53 | 4 | 0 | Doyle Alexander | Len Barker | Jamie Easterly | Randy Moffitt | | 560 | 512 | 48 |
| 1983-08-16 | @ CLE | 119 | W 9-6 | 66-53 | 4 | 9,666 | Matt Williams | Tom Brennan | Joey McLaughlin | Bud Anderson | | 569 | 518 | 51 |
| 1983-08-17 | @ CLE | 120 | W 6-5 | 67-53 | 4 | 6,239 | Luis Leal | Rick Sutcliffe | Joey McLaughlin | Rick Sutcliffe | Roy Lee Jackson | 575 | 523 | 52 |
| 1983-08-19 | @ BOS | 121 | W 8-7 | 68-53 | 4 | 27,386 | Jim Clancy | John Tudor | Jim Acker | Mark Clear | Roy Lee Jackson | 583 | 530 | 53 |
| 1983-08-20 | @ BOS | 122 | L 2-5 | 68-54 | 4 | 29,173 | Dave Stieb | Dennis Eckersley | Dennis Eckersley | Dave Stieb | Bob Stanley | 585 | 535 | 50 |
| 1983-08-21 | @ BOS | 123 | W 7-3 | 69-54 | 4 | 31,159 | Jim Gott | Bruce Hurst | Jim Gott | Bruce Hurst | | 592 | 538 | 54 |
| 1983-08-22 | @ BOS | 124 | L 2-4 | 69-55 | 4 | 26,351 | Doyle Alexander | Bob Ojeda | Bob Ojeda | Doyle Alexander | Bob Stanley | 594 | 542 | 52 |
| 1983-08-23 | @ BAL | 125 | W 9-3 | 70-55 | 4 | 47,387 | Luis Leal | Mike Flanagan | Luis Leal | Mike Flanagan | | 603 | 545 | 58 |
| 1983-08-24 | @ BAL | 126 | L 4-7 | 70-56 | 4 | 25,882 | Jim Clancy | Scott McGregor | Tippy Martinez | Joey McLaughlin | | 607 | 552 | 55 |
| 1983-08-25 | @ BAL | 127 | L 1-2 | 70-57 | 5 | 28,615 | Dave Stieb | Storm Davis | Tippy Martinez | Roy Lee Jackson | | 608 | 554 | 54 |
| 1983-08-26 | @ DET | 128 | L 3-4 | 70-58 | 5 | 46,467 | Jim Gott | Dan Petry | Aurelio Lopez | Jim Gott | | 611 | 558 | 53 |
| 1983-08-27 | @ DET | 129 | W 7-4 | 71-58 | 5 | 39,118 | Doyle Alexander | Glenn Abbott | Doyle Alexander | Aurelio Lopez | Dave Geisel | 618 | 562 | 56 |
| 1983-08-28 | @ DET | 130 | L 2-4 | 71-59 | 5 | 38,332 | Luis Leal | Jack Morris | Jack Morris | Joey McLaughlin | | 620 | 566 | 54 |
| 1983-08-29 | vs BOS | 131 | W 5-1 | 72-60 | 5 | 0 | Jim Clancy | John Tudor | Jim Clancy | John Tudor | | 625 | 567 | 58 |
| 1983-08-29 | vs BOS | 132 | L 7-8 | 72-60 | 5 | 38,338 | Jim Acker | Mike Brown | Mark Clear | Randy Moffitt | Bob Stanley | 632 | 575 | 57 |
| 1983-08-30 | vs BOS | 133 | L 4-5 | 72-61 | 5 | 30,827 | Dave Stieb | Bruce Hurst | John Henry Johnson | Roy Lee Jackson | Mark Clear | 636 | 580 | 56 |
| 1983-08-31 | vs BAL | 134 | L 2-10 | 72-62 | 5 | 37,127 | Jim Gott | Mike Boddicker | Mike Boddicker | Jim Gott | | 638 | 590 | 48 |
| 1983-09-01 | vs BAL | 135 | W 5-3 | 73-62 | 5 | 30,062 | Doyle Alexander | Jim Palmer | Doyle Alexander | Jim Palmer | | 643 | 593 | 50 |
| 1983-09-02 | vs DET | 136 | L 8-9 | 74-63 | 5 | 0 | Luis Leal | Juan Berenguer | Aurelio Lopez | Jim Gott | | 651 | 602 | 49 |
| 1983-09-02 | vs DET | 137 | W 8-7 | 74-63 | 5 | 41,667 | Jim Acker | Milt Wilcox | Jim Acker | Milt Wilcox | Dave Geisel | 659 | 609 | 50 |
| 1983-09-03 | vs DET | 138 | L 4-7 | 74-64 | 5 | 35,268 | Jim Clancy | Dan Petry | Dan Petry | Jim Clancy | John Martin | 663 | 616 | 47 |
| 1983-09-04 | vs DET | 139 | W 6-3 | 75-64 | 5 | 43,158 | Dave Stieb | Glenn Abbott | Dave Stieb | Aurelio Lopez | | 669 | 619 | 50 |
| 1983-09-05 | vs CAL | 140 | W 7-0 | 76-64 | 5 | 24,741 | Jim Gott | Geoff Zahn | Jim Gott | Geoff Zahn | | 676 | 619 | 57 |
| 1983-09-06 | vs CAL | 141 | W 6-4 | 77-64 | 5 | 19,176 | Doyle Alexander | John Curtis | Doyle Alexander | John Curtis | Jim Acker | 682 | 623 | 59 |
| 1983-09-07 | vs CAL | 142 | L 6-9 | 77-65 | 5 | 22,639 | Luis Leal | Ken Forsch | Luis Sanchez | Dave Geisel | | 688 | 632 | 56 |
| 1983-09-09 | vs OAK | 143 | L 5-7 | 77-66 | 5 | 20,336 | Jim Clancy | Steve McCatty | Steve McCatty | Jim Clancy | Keith Atherton | 693 | 639 | 54 |
| 1983-09-10 | vs OAK | 144 | W 7-5 | 78-66 | 5 | 26,434 | Dave Stieb | Tim Conroy | Dave Stieb | Tom Underwood | Randy Moffitt | 700 | 644 | 56 |
| 1983-09-11 | vs OAK | 145 | W 16-6 | 79-66 | 5 | 38,439 | Jim Gott | Chris Codiroli | Jim Gott | Chris Codiroli | | 716 | 650 | 66 |
| 1983-09-13 | @ SEA | 146 | W 6-4 | 80-66 | 4 | 4,340 | Luis Leal | Bob Stoddard | Luis Leal | Bob Stoddard | Roy Lee Jackson | 722 | 654 | 68 |
| 1983-09-14 | @ SEA | 147 | W 4-3 | 81-66 | 4 | 4,800 | Jim Clancy | Matt Young | Doyle Alexander | Roy Thomas | | 726 | 657 | 69 |
| 1983-09-15 | @ MIN | 148 | L 2-6 | 81-67 | 4 | 4,039 | Dave Stieb | Ken Schrom | Ken Schrom | Dave Stieb | | 728 | 663 | 65 |
| 1983-09-16 | @ MIN | 149 | L 4-11 | 81-68 | 4 | 11,640 | Jim Gott | Pete Filson | Rick Lysander | Jim Gott | | 732 | 674 | 58 |
| 1983-09-17 | @ MIN | 150 | W 13-3 | 82-68 | 4 | 6,300 | Luis Leal | Jay Pettibone | Luis Leal | Jay Pettibone | | 745 | 677 | 68 |
| 1983-09-19 | vs SEA | 151 | L 6-9 | 82-69 | 4 | 10,484 | Jim Clancy | Matt Young | Matt Young | Dave Geisel | Ed Vande Berg | 751 | 686 | 65 |
| 1983-09-20 | vs SEA | 152 | W 7-3 | 83-69 | 4 | 15,657 | Dave Stieb | Mike Moore | Dave Stieb | Mike Moore | | 758 | 689 | 69 |
| 1983-09-21 | vs SEA | 153 | W 4-3 | 84-69 | 4 | 16,321 | Doyle Alexander | Bryan Clark | Doyle Alexander | Bryan Clark | | 762 | 692 | 70 |
| 1983-09-23 | @ OAK | 154 | L 0-2 | 84-70 | 4 | 8,069 | Luis Leal | Tim Conroy | Tim Conroy | Luis Leal | | 762 | 694 | 68 |
| 1983-09-24 | @ OAK | 155 | L 1-2 | 84-71 | 4 | 11,732 | Jim Clancy | Mike Warren | Mike Warren | Jim Clancy | | 763 | 696 | 67 |
| 1983-09-25 | @ OAK | 156 | W 8-6 | 85-71 | 4 | 14,650 | Dave Stieb | Steve McCatty | Jim Acker | Keith Atherton | | 771 | 702 | 69 |
| 1983-09-26 | @ CAL | 157 | W 3-2 | 86-71 | 4 | 19,713 | Doyle Alexander | Geoff Zahn | Doyle Alexander | Bob Lacey | Roy Lee Jackson | 774 | 704 | 70 |
| 1983-09-27 | @ CAL | 158 | L 1-7 | 86-72 | 4 | 20,559 | Luis Leal | Byron McLaughlin | Byron McLaughlin | Luis Leal | John Curtis | 775 | 711 | 64 |
| 1983-09-28 | @ CAL | 159 | W 5-3 | 87-72 | 4 | 20,592 | Jim Clancy | Mike Witt | Jim Clancy | Mike Witt | Roy Lee Jackson | 780 | 714 | 66 |
| 1983-09-30 | vs MIN | 160 | W 8-0 | 88-72 | 4 | 18,501 | Dave Stieb | Frank Viola | Dave Stieb | Frank Viola | | 788 | 714 | 74 |
| 1983-10-01 | vs MIN | 161 | W 4-3 | 89-72 | 4 | 25,332 | Doyle Alexander | Jay Pettibone | Doyle Alexander | Jay Pettibone | | 792 | 717 | 75 |
| 1983-10-02 | vs MIN | 162 | L 3-9 | 89-73 | 4 | 40,692 | Jim Clancy | Albert Williams | Albert Williams | Jim Clancy | | 795 | 726 | 69 |