| 1983-04-04 | vs CHA | 1 | W 5-3 | 1-0 | 2 | 13,140 | Mike Smithson | LaMarr Hoyt | John Butcher | LaMarr Hoyt | | 5 | 3 | 2 |
| 1983-04-05 | vs CHA | 2 | W 4-1 | 2-0 | 3 | 6,342 | Jon Matlack | Floyd Bannister | Jon Matlack | Floyd Bannister | Odell Jones | 9 | 4 | 5 |
| 1983-04-06 | vs CHA | 3 | W 4-1 | 3-0 | 2 | 6,912 | Rick Honeycutt | Richard Dotson | Rick Honeycutt | Richard Dotson | Dave Tobik | 13 | 5 | 8 |
| 1983-04-08 | vs BOS | 4 | L 5-8 | 3-1 | 1 | 7,726 | John Butcher | Mike Brown | Luis Aponte | Mike Mason | | 18 | 13 | 5 |
| 1983-04-09 | vs BOS | 5 | W 10-3 | 4-1 | 1 | 20,850 | Mike Smithson | Bob Ojeda | Mike Smithson | Bob Ojeda | | 28 | 16 | 12 |
| 1983-04-10 | vs BOS | 6 | W 9-7 | 5-1 | 1 | 18,597 | Jon Matlack | Dennis Eckersley | Charlie Hough | Bob Stanley | | 37 | 23 | 14 |
| 1983-04-12 | @ CLE | 7 | W 2-1 | 6-1 | 1 | 5,133 | Rick Honeycutt | Bert Blyleven | Rick Honeycutt | Bert Blyleven | Odell Jones | 39 | 24 | 15 |
| 1983-04-13 | @ CLE | 8 | L 3-4 | 6-2 | 1 | 4,078 | Charlie Hough | Len Barker | Len Barker | Mike Mason | Dan Spillner | 42 | 28 | 14 |
| 1983-04-15 | @ BOS | 9 | L 1-4 | 6-3 | 1 | 13,553 | Jon Matlack | Dennis Eckersley | Dennis Eckersley | Jon Matlack | Bob Stanley | 43 | 32 | 11 |
| 1983-04-16 | @ BOS | 10 | L 1-2 | 6-4 | 4 | 13,534 | Danny Darwin | Bruce Hurst | Bruce Hurst | Danny Darwin | Mark Clear | 44 | 34 | 10 |
| 1983-04-17 | @ BOS | 11 | W 1-0 | 7-4 | 2 | 16,038 | Rick Honeycutt | John Tudor | Odell Jones | Bob Stanley | Dave Tobik | 45 | 34 | 11 |
| 1983-04-19 | @ BAL | 12 | L 2-4 | 7-5 | 2 | 6,305 | Charlie Hough | Storm Davis | Sammy Stewart | Charlie Hough | | 47 | 38 | 9 |
| 1983-04-20 | @ BAL | 13 | W 11-2 | 8-5 | 2 | 6,947 | Mike Smithson | Dennis Martinez | Mike Smithson | Dennis Martinez | | 58 | 40 | 18 |
| 1983-04-21 | @ BAL | 14 | L 2-3 | 8-6 | 4 | 10,311 | Jon Matlack | Jim Palmer | Tim Stoddard | Odell Jones | | 60 | 43 | 17 |
| 1983-04-22 | vs MIL | 15 | W 3-2 | 9-6 | 3 | 14,008 | Danny Darwin | Bob McClure | Danny Darwin | Bob McClure | | 63 | 45 | 18 |
| 1983-04-23 | vs MIL | 16 | L 0-3 | 9-7 | 4 | 20,142 | Rick Honeycutt | Mike Caldwell | Mike Caldwell | Rick Honeycutt | | 63 | 48 | 15 |
| 1983-04-24 | vs MIL | 17 | L 1-3 | 9-8 | 4 | 19,133 | Charlie Hough | Don Sutton | Don Sutton | Charlie Hough | Pete Ladd | 64 | 51 | 13 |
| 1983-04-26 | vs TOR | 18 | W 2-1 | 10-8 | 4 | 17,380 | Mike Smithson | Dave Stieb | Mike Smithson | Dave Stieb | | 66 | 52 | 14 |
| 1983-04-27 | vs TOR | 19 | L 2-3 | 10-9 | 4 | 7,518 | Danny Darwin | Jim Clancy | Randy Moffitt | Danny Darwin | | 68 | 55 | 13 |
| 1983-04-29 | vs NYA | 20 | W 8-3 | 11-9 | 4 | 16,104 | Rick Honeycutt | Shane Rawley | Rick Honeycutt | Shane Rawley | | 76 | 58 | 18 |
| 1983-04-30 | vs NYA | 21 | W 6-3 | 12-9 | 3 | 32,959 | Charlie Hough | Ron Guidry | Charlie Hough | Ron Guidry | John Butcher | 82 | 61 | 21 |
| 1983-05-01 | vs NYA | 22 | L 4-8 | 12-10 | 4 | 28,287 | Mike Smithson | Dave Righetti | Dave Righetti | Mike Smithson | Dale Murray | 86 | 69 | 17 |
| 1983-05-02 | @ TOR | 23 | L 5-6 | 12-11 | 4 | 10,525 | Danny Darwin | Jim Clancy | Jim Clancy | Danny Darwin | Randy Moffitt | 91 | 75 | 16 |
| 1983-05-03 | @ TOR | 24 | W 7-2 | 13-11 | 4 | 10,125 | Jon Matlack | Jim Gott | Jon Matlack | Jim Gott | Dave Tobik | 98 | 77 | 21 |
| 1983-05-04 | @ TOR | 25 | L 1-7 | 13-12 | 4 | 11,280 | Rick Honeycutt | Luis Leal | Luis Leal | Rick Honeycutt | | 99 | 84 | 15 |
| 1983-05-06 | @ MIL | 26 | W 9-4 | 14-12 | 3 | 18,042 | Charlie Hough | Mike Caldwell | John Butcher | Mike Caldwell | Odell Jones | 108 | 88 | 20 |
| 1983-05-08 | @ MIL | 27 | L 3-6 | 14-13 | 4 | 14,763 | Mike Smithson | Don Sutton | Jim Slaton | Odell Jones | | 111 | 94 | 17 |
| 1983-05-10 | @ NYA | 28 | W 4-2 | 15-13 | 2 | 13,893 | Danny Darwin | Shane Rawley | Frank Tanana | Shane Rawley | Odell Jones | 115 | 96 | 19 |
| 1983-05-11 | @ NYA | 29 | W 3-1 | 16-13 | 2 | 16,679 | Rick Honeycutt | Ron Guidry | Rick Honeycutt | Ron Guidry | Dave Tobik | 118 | 97 | 21 |
| 1983-05-13 | vs BAL | 30 | L 1-8 | 16-14 | 2 | 17,463 | Charlie Hough | Storm Davis | Storm Davis | Charlie Hough | | 119 | 105 | 14 |
| 1983-05-14 | vs BAL | 31 | L 11-14 | 16-15 | 2 | 12,198 | Mike Smithson | Scott McGregor | Tippy Martinez | Dave Tobik | Tim Stoddard | 130 | 119 | 11 |
| 1983-05-15 | vs BAL | 32 | W 2-1 | 17-15 | 2 | 11,262 | Danny Darwin | Dennis Martinez | Danny Darwin | Dennis Martinez | Odell Jones | 132 | 120 | 12 |
| 1983-05-16 | vs CLE | 33 | W 3-1 | 18-15 | 1 | 18,481 | Rick Honeycutt | Len Barker | Rick Honeycutt | Len Barker | | 135 | 121 | 14 |
| 1983-05-17 | vs CLE | 34 | W 6-5 | 19-15 | 1 | 26,568 | Jon Matlack | Rick Sutcliffe | Dave J. Schmidt | Ed Glynn | | 141 | 126 | 15 |
| 1983-05-18 | vs CLE | 35 | W 3-2 | 20-15 | 1 | 13,203 | Charlie Hough | Lary Sorensen | Dave Tobik | Neal Heaton | | 144 | 128 | 16 |
| 1983-05-19 | @ DET | 36 | L 1-2 | 20-16 | 1 | 5,868 | Mike Smithson | Milt Wilcox | Milt Wilcox | Mike Smithson | | 145 | 130 | 15 |
| 1983-05-20 | @ DET | 37 | W 4-0 | 21-16 | 1 | 14,202 | Danny Darwin | Jerry Ujdur | Danny Darwin | Jerry Ujdur | | 149 | 130 | 19 |
| 1983-05-21 | @ DET | 38 | L 3-5 | 21-17 | 1 | 15,912 | Rick Honeycutt | Dan Petry | Dan Petry | Rick Honeycutt | Aurelio Lopez | 152 | 135 | 17 |
| 1983-05-22 | @ DET | 39 | L 5-12 | 21-18 | 1 | 12,389 | Jon Matlack | Dave Rozema | Juan Berenguer | John Butcher | | 157 | 147 | 10 |
| 1983-05-23 | @ KCA | 40 | L 2-5 | 21-19 | 3 | 23,938 | Charlie Hough | Dennis Leonard | Dennis Leonard | Charlie Hough | Dan Quisenberry | 159 | 152 | 7 |
| 1983-05-24 | @ KCA | 41 | L 2-2 | 21-20 | 3 | 17,583 | Mike Smithson | Paul Splittorff | | | | 161 | 154 | 7 |
| 1983-05-25 | @ KCA | 42 | L 2-5 | 21-21 | 4 | 22,604 | Danny Darwin | Buddy Black | Buddy Black | Danny Darwin | Dan Quisenberry | 163 | 159 | 4 |
| 1983-05-26 | @ CHA | 43 | W 3-1 | 22-21 | 4 | 17,232 | Rick Honeycutt | Floyd Bannister | Rick Honeycutt | Floyd Bannister | Odell Jones | 166 | 160 | 6 |
| 1983-05-27 | @ CHA | 44 | L 2-3 | 22-22 | 4 | 17,527 | Frank Tanana | LaMarr Hoyt | LaMarr Hoyt | Frank Tanana | | 168 | 163 | 5 |
| 1983-05-28 | @ CHA | 45 | L 3-8 | 22-23 | 4 | 18,197 | Charlie Hough | Richard Dotson | Richard Dotson | Charlie Hough | Dick Tidrow | 171 | 171 | 0 |
| 1983-05-29 | @ CHA | 46 | L 3-8 | 22-24 | 4 | 23,239 | Mike Smithson | Jerry Koosman | Jerry Koosman | Mike Smithson | | 174 | 179 | -5 |
| 1983-05-31 | vs KCA | 47 | L 5-6 | 22-25 | 4 | 10,448 | Danny Darwin | Buddy Black | Buddy Black | Danny Darwin | Dan Quisenberry | 179 | 185 | -6 |
| 1983-06-01 | vs KCA | 48 | W 7-4 | 23-25 | 4 | 11,729 | Rick Honeycutt | Steve Renko | Rick Honeycutt | Steve Renko | | 186 | 189 | -3 |
| 1983-06-03 | vs DET | 49 | L 1-12 | 23-26 | 5 | 18,962 | Mike Smithson | Jack Morris | Jack Morris | Mike Smithson | | 187 | 201 | -14 |
| 1983-06-04 | vs DET | 50 | W 5-2 | 24-26 | 4 | 25,071 | Charlie Hough | Dan Petry | Charlie Hough | Dan Petry | Odell Jones | 192 | 203 | -11 |
| 1983-06-05 | vs DET | 51 | L 4-5 | 24-27 | 5 | 13,763 | Danny Darwin | Larry Pashnick | Aurelio Lopez | John Butcher | | 196 | 208 | -12 |
| 1983-06-07 | @ SEA | 52 | W 10-0 | 25-27 | 5 | 5,284 | Rick Honeycutt | Bob Stoddard | Rick Honeycutt | Bob Stoddard | | 206 | 208 | -2 |
| 1983-06-08 | @ SEA | 53 | W 1-0 | 26-27 | 4 | 6,529 | Mike Smithson | Matt Young | Mike Smithson | Matt Young | Odell Jones | 207 | 208 | -1 |
| 1983-06-09 | @ SEA | 54 | L 2-3 | 26-28 | 4 | 4,915 | Charlie Hough | Jim Beattie | Bill Caudill | Charlie Hough | | 209 | 211 | -2 |
| 1983-06-10 | @ MIN | 55 | W 4-2 | 27-28 | 4 | 5,282 | Frank Tanana | Frank Viola | Frank Tanana | Frank Viola | John Butcher | 213 | 213 | 0 |
| 1983-06-11 | @ MIN | 56 | W 11-0 | 28-28 | 4 | 11,363 | Danny Darwin | Brad Havens | Danny Darwin | Brad Havens | | 224 | 213 | 11 |
| 1983-06-12 | @ MIN | 57 | W 4-3 | 29-28 | 3 | 4,707 | Rick Honeycutt | Ken Schrom | Odell Jones | Ron Davis | | 228 | 216 | 12 |
| 1983-06-13 | vs SEA | 58 | W 5-2 | 30-28 | 3 | 31,238 | Mike Smithson | Matt Young | Mike Smithson | Matt Young | John Butcher | 233 | 218 | 15 |
| 1983-06-14 | vs SEA | 59 | W 7-1 | 31-28 | 2 | 11,118 | Charlie Hough | Jim Beattie | Charlie Hough | Jim Beattie | | 240 | 219 | 21 |
| 1983-06-15 | vs SEA | 60 | L 4-6 | 31-29 | 2 | 12,604 | Frank Tanana | Bob Stoddard | Ed Vande Berg | Odell Jones | | 244 | 225 | 19 |
| 1983-06-16 | vs MIN | 61 | L 3-4 | 31-30 | 3 | 10,011 | Danny Darwin | Bryan Oelkers | Rick Lysander | Danny Darwin | Ron Davis | 247 | 229 | 18 |
| 1983-06-17 | vs MIN | 62 | W 10-1 | 32-30 | 3 | 15,610 | Rick Honeycutt | Ken Schrom | Rick Honeycutt | Ken Schrom | | 257 | 230 | 27 |
| 1983-06-18 | vs MIN | 63 | L 4-8 | 32-31 | 3 | 35,812 | Mike Smithson | Bobby Castillo | Bobby Castillo | Mike Smithson | Ron Davis | 261 | 238 | 23 |
| 1983-06-19 | vs MIN | 64 | W 4-1 | 33-31 | 3 | 15,166 | Charlie Hough | Albert Williams | Charlie Hough | Albert Williams | | 265 | 239 | 26 |
| 1983-06-20 | vs CAL | 65 | L 9-10 | 33-32 | 3 | 22,412 | Frank Tanana | Tommy John | John Curtis | Jon Matlack | | 274 | 249 | 25 |
| 1983-06-21 | vs CAL | 66 | W 3-2 | 34-32 | 3 | 24,333 | Danny Darwin | Byron McLaughlin | Danny Darwin | Byron McLaughlin | Dave J. Schmidt | 277 | 251 | 26 |
| 1983-06-22 | vs CAL | 67 | W 9-1 | 35-32 | 3 | 29,197 | Rick Honeycutt | Bill Travers | Rick Honeycutt | Bill Travers | | 286 | 252 | 34 |
| 1983-06-24 | vs OAK | 68 | W 6-5 | 37-32 | 2 | 0 | Mike Smithson | Tom Underwood | Mike Smithson | Steve Baker | | 292 | 257 | 35 |
| 1983-06-24 | vs OAK | 69 | W 6-2 | 37-32 | 2 | 24,297 | Charlie Hough | Curt Young | Charlie Hough | Curt Young | | 298 | 259 | 39 |
| 1983-06-25 | vs OAK | 70 | W 8-3 | 38-32 | 1 | 22,112 | Frank Tanana | Bill Krueger | Frank Tanana | Bill Krueger | John Butcher | 306 | 262 | 44 |
| 1983-06-26 | vs OAK | 71 | W 4-1 | 39-32 | 1 | 27,600 | Danny Darwin | Steve McCatty | Danny Darwin | Steve McCatty | | 310 | 263 | 47 |
| 1983-06-27 | @ CAL | 72 | L 0-8 | 39-33 | 2 | 42,578 | Rick Honeycutt | Bruce Kison | Bruce Kison | Rick Honeycutt | | 310 | 271 | 39 |
| 1983-06-28 | @ CAL | 73 | W 3-1 | 40-33 | 1 | 30,028 | Charlie Hough | Ken Forsch | Charlie Hough | Ken Forsch | Dave J. Schmidt | 313 | 272 | 41 |
| 1983-06-29 | @ CAL | 74 | L 1-2 | 40-34 | 2 | 30,464 | Mike Smithson | Tommy John | Luis Sanchez | Mike Smithson | | 314 | 274 | 40 |
| 1983-06-30 | @ CAL | 75 | W 4-2 | 41-34 | 1 | 30,190 | Frank Tanana | Mike Witt | Dave J. Schmidt | Luis Sanchez | | 318 | 276 | 42 |
| 1983-07-01 | @ OAK | 76 | W 8-5 | 42-34 | 1 | 9,326 | Danny Darwin | Ben Callahan | Danny Darwin | Ben Callahan | Dave Tobik | 326 | 281 | 45 |
| 1983-07-02 | @ OAK | 77 | W 13-3 | 43-34 | 1 | 18,760 | Rick Honeycutt | Tom Underwood | Rick Honeycutt | Tom Underwood | | 339 | 284 | 55 |
| 1983-07-03 | @ OAK | 78 | W 16-4 | 44-34 | 1 | 20,697 | Charlie Hough | Jeff Jones | Odell Jones | Dave Beard | | 355 | 288 | 67 |
| 1983-07-04 | @ OAK | 79 | L 3-4 | 44-35 | 1 | 45,413 | Mike Smithson | Steve McCatty | Steve McCatty | Mike Smithson | Tom Underwood | 358 | 292 | 66 |
| 1983-07-08 | @ TOR | 80 | L 5-8 | 44-36 | 1 | 25,666 | Danny Darwin | Jim Clancy | Jim Clancy | Danny Darwin | Randy Moffitt | 363 | 300 | 63 |
| 1983-07-09 | @ TOR | 81 | L 1-5 | 44-37 | 1 | 26,234 | Charlie Hough | Luis Leal | Luis Leal | Charlie Hough | | 364 | 305 | 59 |
| 1983-07-10 | @ TOR | 82 | L 4-6 | 44-38 | 2 | 32,071 | Rick Honeycutt | Dave Stieb | Dave Stieb | Rick Honeycutt | Randy Moffitt | 368 | 311 | 57 |
| 1983-07-11 | vs MIL | 83 | W 5-4 | 45-38 | 1 | 27,343 | Mike Smithson | Moose Haas | Dave Tobik | Jerry Augustine | | 373 | 315 | 58 |
| 1983-07-12 | vs MIL | 84 | L 2-9 | 45-39 | 1 | 23,171 | Frank Tanana | Chuck Porter | Chuck Porter | Frank Tanana | | 375 | 324 | 51 |
| 1983-07-13 | vs MIL | 85 | L 2-6 | 45-40 | 2 | 28,540 | Danny Darwin | Bob McClure | Bob McClure | Danny Darwin | Jim Slaton | 377 | 330 | 47 |
| 1983-07-14 | @ NYA | 86 | W 11-2 | 46-40 | 1 | 21,563 | Charlie Hough | Shane Rawley | Charlie Hough | Shane Rawley | | 388 | 332 | 56 |
| 1983-07-15 | @ NYA | 87 | L 5-7 | 46-41 | 1 | 22,079 | Rick Honeycutt | Dave Righetti | Dave Righetti | Rick Honeycutt | Rich Gossage | 393 | 339 | 54 |
| 1983-07-16 | @ NYA | 88 | L 1-3 | 46-42 | 1 | 41,520 | Mike Smithson | Ray Fontenot | Ray Fontenot | Mike Smithson | Rich Gossage | 394 | 342 | 52 |
| 1983-07-17 | @ NYA | 89 | L 6-8 | 46-43 | 2 | 27,198 | Frank Tanana | Matt Keough | Dale Murray | Odell Jones | | 400 | 350 | 50 |
| 1983-07-18 | @ MIL | 90 | L 3-4 | 46-45 | 3 | 0 | Danny Darwin | Bob Gibson | Jerry Augustine | Danny Darwin | Pete Ladd | 403 | 354 | 49 |
| 1983-07-18 | @ MIL | 91 | L 4-5 | 46-45 | 3 | 28,076 | Charlie Hough | Bob McClure | Tom Tellmann | Charlie Hough | Pete Ladd | 407 | 359 | 48 |
| 1983-07-19 | @ MIL | 92 | W 3-1 | 47-45 | 3 | 21,236 | Rick Honeycutt | Don Sutton | Rick Honeycutt | Don Sutton | John Butcher | 410 | 360 | 50 |
| 1983-07-20 | @ MIL | 93 | L 3-4 | 47-46 | 4 | 35,645 | Mike Smithson | Mike Caldwell | Tom Tellmann | Mike Smithson | Pete Ladd | 413 | 364 | 49 |
| 1983-07-21 | vs TOR | 94 | W 3-2 | 48-46 | 2 | 18,323 | Frank Tanana | Jim Gott | Frank Tanana | Jim Gott | | 416 | 366 | 50 |
| 1983-07-22 | vs TOR | 95 | L 5-10 | 48-47 | 3 | 28,075 | Charlie Hough | Doyle Alexander | Randy Moffitt | Dave J. Schmidt | | 421 | 376 | 45 |
| 1983-07-23 | vs TOR | 96 | L 2-3 | 48-48 | 3 | 43,705 | Danny Darwin | Jim Clancy | Jim Clancy | Danny Darwin | | 423 | 379 | 44 |
| 1983-07-24 | vs TOR | 97 | W 3-0 | 49-48 | 3 | 30,123 | Rick Honeycutt | Luis Leal | Rick Honeycutt | Luis Leal | | 426 | 379 | 47 |
| 1983-07-25 | vs NYA | 98 | L 5-6 | 49-49 | 3 | 28,484 | Mike Smithson | Dave Righetti | Rich Gossage | John Butcher | | 431 | 385 | 46 |
| 1983-07-26 | vs NYA | 99 | L 0-5 | 49-50 | 3 | 33,775 | Frank Tanana | Ray Fontenot | Ray Fontenot | Frank Tanana | | 431 | 390 | 41 |
| 1983-07-27 | vs NYA | 100 | L 3-4 | 49-51 | 3 | 28,171 | Charlie Hough | Matt Keough | Matt Keough | Charlie Hough | Rich Gossage | 434 | 394 | 40 |
| 1983-07-29 | @ BAL | 101 | L 6-8 | 49-52 | 3 | 44,970 | Rick Honeycutt | Storm Davis | Sammy Stewart | Dave J. Schmidt | | 440 | 402 | 38 |
| 1983-07-30 | @ BAL | 102 | L 4-7 | 49-53 | 3 | 32,884 | Mike Smithson | Scott McGregor | Scott McGregor | Mike Smithson | Tim Stoddard | 444 | 409 | 35 |
| 1983-07-31 | @ BAL | 103 | L 0-6 | 49-54 | 3 | 23,174 | Frank Tanana | Mike Boddicker | Mike Boddicker | Frank Tanana | | 444 | 415 | 29 |
| 1983-08-02 | vs BOS | 104 | L 5-6 | 49-55 | 4 | 17,475 | Charlie Hough | Oil Can Boyd | Oil Can Boyd | Charlie Hough | Bob Stanley | 449 | 421 | 28 |
| 1983-08-03 | vs BOS | 105 | L 4-5 | 49-56 | 4 | 15,344 | Danny Darwin | Dennis Eckersley | Luis Aponte | Victor Cruz | Mark Clear | 453 | 426 | 27 |
| 1983-08-04 | vs BOS | 106 | W 6-1 | 50-56 | 4 | 17,594 | Rick Honeycutt | John Tudor | Rick Honeycutt | John Tudor | | 459 | 427 | 32 |
| 1983-08-05 | @ CLE | 107 | W 2-0 | 51-56 | 4 | 10,303 | Mike Smithson | Lary Sorensen | Mike Smithson | Lary Sorensen | Odell Jones | 461 | 427 | 34 |
| 1983-08-06 | @ CLE | 108 | W 6-1 | 52-56 | 3 | 13,866 | Frank Tanana | Len Barker | Frank Tanana | Len Barker | | 467 | 428 | 39 |
| 1983-08-07 | @ CLE | 109 | W 4-3 | 53-57 | 3 | 0 | Charlie Hough | Bert Blyleven | Charlie Hough | Dan Spillner | Victor Cruz | 471 | 431 | 40 |
| 1983-08-07 | @ CLE | 110 | L 0-7 | 53-57 | 3 | 19,213 | Jon Matlack | Tom Brennan | Tom Brennan | Jon Matlack | | 471 | 438 | 33 |
| 1983-08-08 | @ BOS | 111 | W 12-7 | 54-57 | 3 | 21,887 | Danny Darwin | Dennis Eckersley | John Butcher | Bob Stanley | | 483 | 445 | 38 |
| 1983-08-09 | @ BOS | 112 | L 4-6 | 54-58 | 4 | 21,022 | Rick Honeycutt | John Tudor | John Tudor | Rick Honeycutt | | 487 | 451 | 36 |
| 1983-08-10 | @ BOS | 113 | L 2-4 | 54-59 | 4 | 22,679 | Mike Smithson | Bruce Hurst | Bruce Hurst | Mike Smithson | Bob Stanley | 489 | 455 | 34 |
| 1983-08-12 | vs CLE | 114 | W 6-2 | 55-59 | 3 | 19,310 | Frank Tanana | Tom Brennan | Frank Tanana | Tom Brennan | Odell Jones | 495 | 457 | 38 |
| 1983-08-13 | vs CLE | 115 | W 4-3 | 56-59 | 3 | 32,563 | Charlie Hough | Rick Sutcliffe | Charlie Hough | Rick Sutcliffe | Victor Cruz | 499 | 460 | 39 |
| 1983-08-14 | vs CLE | 116 | L 0-3 | 56-60 | 3 | 12,957 | Rick Honeycutt | Neal Heaton | Neal Heaton | Rick Honeycutt | | 499 | 463 | 36 |
| 1983-08-15 | vs BAL | 117 | L 4-6 | 56-61 | 4 | 9,660 | Mike Smithson | Mike Boddicker | Mike Boddicker | Mike Smithson | Tim Stoddard | 503 | 469 | 34 |
| 1983-08-16 | vs BAL | 118 | W 2-0 | 57-61 | 4 | 11,931 | John Butcher | Allan Ramirez | John Butcher | Allan Ramirez | | 505 | 469 | 36 |
| 1983-08-17 | vs BAL | 119 | L 2-4 | 57-62 | 4 | 12,177 | Frank Tanana | Mike Flanagan | Mike Flanagan | Odell Jones | Tim Stoddard | 507 | 473 | 34 |
| 1983-08-19 | vs CHA | 120 | L 2-3 | 57-64 | 4 | 0 | Mike Smithson | Richard Dotson | Richard Dotson | Victor Cruz | Juan Agosto | 509 | 476 | 33 |
| 1983-08-19 | vs CHA | 121 | L 1-6 | 57-64 | 4 | 21,946 | Charlie Hough | Jerry Koosman | Jerry Koosman | Charlie Hough | Dick Tidrow | 510 | 482 | 28 |
| 1983-08-20 | vs CHA | 122 | W 6-1 | 58-64 | 4 | 21,232 | Dave Stewart | Britt Burns | Dave Stewart | Britt Burns | Tom Henke | 516 | 483 | 33 |
| 1983-08-21 | vs CHA | 123 | L 1-3 | 58-65 | 4 | 11,861 | John Butcher | Floyd Bannister | Floyd Bannister | John Butcher | Salome Barojas | 517 | 486 | 31 |
| 1983-08-22 | vs DET | 124 | W 3-1 | 59-65 | 4 | 19,393 | Frank Tanana | Dan Petry | Frank Tanana | Dan Petry | Victor Cruz | 520 | 487 | 33 |
| 1983-08-23 | vs DET | 125 | L 0-2 | 59-66 | 4 | 10,974 | Charlie Hough | Doug Bair | Doug Bair | Charlie Hough | Aurelio Lopez | 520 | 489 | 31 |
| 1983-08-24 | vs DET | 126 | L 2-5 | 59-67 | 4 | 19,258 | Mike Smithson | Jack Morris | Jack Morris | Victor Cruz | | 522 | 494 | 28 |
| 1983-08-25 | @ KCA | 127 | L 1-3 | 59-69 | 5 | 0 | Jon Matlack | Eric Rasmussen | Eric Rasmussen | Jon Matlack | Dan Quisenberry | 523 | 497 | 26 |
| 1983-08-25 | @ KCA | 128 | L 4-5 | 59-69 | 5 | 26,206 | Dave Stewart | Larry Gura | Mike Armstrong | Dave J. Schmidt | | 527 | 502 | 25 |
| 1983-08-26 | @ KCA | 129 | L 3-8 | 59-70 | 5 | 34,597 | John Butcher | Buddy Black | Buddy Black | John Butcher | | 530 | 510 | 20 |
| 1983-08-27 | @ KCA | 130 | L 0-2 | 59-71 | 5 | 35,259 | Frank Tanana | Paul Splittorff | Paul Splittorff | Frank Tanana | Dan Quisenberry | 530 | 512 | 18 |
| 1983-08-28 | @ KCA | 131 | W 1-0 | 60-71 | 5 | 29,133 | Charlie Hough | Steve Renko | Charlie Hough | Steve Renko | | 531 | 512 | 19 |
| 1983-08-29 | @ CHA | 132 | L 1-2 | 60-72 | 5 | 33,987 | Mike Smithson | Richard Dotson | Richard Dotson | Mike Smithson | | 532 | 514 | 18 |
| 1983-08-30 | @ CHA | 133 | L 0-5 | 60-73 | 5 | 26,666 | Dave Stewart | Britt Burns | Britt Burns | Dave Stewart | Dick Tidrow | 532 | 519 | 13 |
| 1983-08-31 | @ DET | 134 | W 5-1 | 61-73 | 5 | 23,287 | John Butcher | Glenn Abbott | John Butcher | Glenn Abbott | Victor Cruz | 537 | 520 | 17 |
| 1983-09-01 | @ DET | 135 | L 0-5 | 61-74 | 5 | 23,011 | Frank Tanana | Jack Morris | Jack Morris | Frank Tanana | | 537 | 525 | 12 |
| 1983-09-02 | vs KCA | 136 | W 7-0 | 62-74 | 5 | 8,515 | Charlie Hough | Paul Splittorff | Charlie Hough | Paul Splittorff | | 544 | 525 | 19 |
| 1983-09-03 | vs KCA | 137 | L 0-5 | 63-75 | 5 | 0 | Danny Darwin | Gaylord Perry | Gaylord Perry | Danny Darwin | | 544 | 530 | 14 |
| 1983-09-03 | vs KCA | 138 | W 8-1 | 63-75 | 5 | 16,297 | Mike Smithson | Keith Creel | Mike Smithson | Keith Creel | | 552 | 531 | 21 |
| 1983-09-04 | vs KCA | 139 | W 3-2 | 64-75 | 5 | 13,872 | Dave Stewart | Eric Rasmussen | Dave Stewart | Eric Rasmussen | Victor Cruz | 555 | 533 | 22 |
| 1983-09-05 | vs MIN | 140 | W 7-3 | 65-75 | 4 | 5,124 | John Butcher | Rick Lysander | John Butcher | Rick Lysander | | 562 | 536 | 26 |
| 1983-09-06 | vs MIN | 141 | L 3-5 | 65-76 | 4 | 7,057 | Frank Tanana | Frank Viola | Ron Davis | Frank Tanana | Mike Walters | 565 | 541 | 24 |
| 1983-09-07 | vs MIN | 142 | W 3-0 | 66-76 | 4 | 5,634 | Charlie Hough | Albert Williams | Charlie Hough | Albert Williams | | 568 | 541 | 27 |
| 1983-09-09 | @ SEA | 143 | L 4-6 | 66-77 | 4 | 4,701 | Mike Smithson | Mike Moore | Mike Moore | Mike Smithson | Mike Stanton | 572 | 547 | 25 |
| 1983-09-10 | @ SEA | 144 | L 2-4 | 66-78 | 4 | 6,309 | Danny Darwin | Bryan Clark | Bryan Clark | Danny Darwin | | 574 | 551 | 23 |
| 1983-09-11 | @ SEA | 145 | W 2-1 | 67-78 | 4 | 4,080 | Dave Stewart | Jim Beattie | Dave Stewart | Jim Beattie | Dave Tobik | 576 | 552 | 24 |
| 1983-09-13 | @ OAK | 146 | L 5-6 | 67-79 | 4 | 5,643 | Frank Tanana | Mike Warren | Mike Warren | Frank Tanana | Keith Atherton | 581 | 558 | 23 |
| 1983-09-14 | @ OAK | 147 | W 4-2 | 68-79 | 4 | 8,890 | Charlie Hough | Steve McCatty | Charlie Hough | Steve McCatty | Dave Tobik | 585 | 560 | 25 |
| 1983-09-15 | @ OAK | 148 | W 6-5 | 69-79 | 3 | 6,947 | Mike Smithson | Tim Conroy | Dave J. Schmidt | Tim Conroy | Dave Tobik | 591 | 565 | 26 |
| 1983-09-16 | @ CAL | 149 | L 6-8 | 69-80 | 3 | 21,850 | Danny Darwin | Geoff Zahn | Luis Sanchez | John Butcher | | 597 | 573 | 24 |
| 1983-09-17 | @ CAL | 150 | W 5-2 | 70-80 | 3 | 34,608 | Dave Stewart | Ken Forsch | Dave Stewart | Ken Forsch | Dave Tobik | 602 | 575 | 27 |
| 1983-09-18 | @ CAL | 151 | W 7-6 | 71-80 | 3 | 22,556 | Frank Tanana | Mike Witt | Victor Cruz | Bob Lacey | | 609 | 581 | 28 |
| 1983-09-20 | vs OAK | 152 | W 3-2 | 72-80 | 3 | 5,272 | Charlie Hough | Steve McCatty | Charlie Hough | Keith Atherton | | 612 | 583 | 29 |
| 1983-09-21 | vs OAK | 153 | W 4-2 | 73-80 | 3 | 5,869 | Mike Smithson | Chris Codiroli | Mike Smithson | Chris Codiroli | | 616 | 585 | 31 |
| 1983-09-22 | vs SEA | 154 | W 5-2 | 74-80 | 3 | 8,739 | Danny Darwin | Jim Beattie | Danny Darwin | Jim Beattie | | 621 | 587 | 34 |
| 1983-09-23 | vs SEA | 155 | W 2-1 | 75-80 | 3 | 7,902 | Dave Stewart | Gene Nelson | Dave Stewart | Gene Nelson | | 623 | 588 | 35 |
| 1983-09-24 | vs SEA | 156 | L 0-2 | 75-81 | 3 | 9,790 | Frank Tanana | Mike Moore | Mike Moore | Frank Tanana | Bill Caudill | 623 | 590 | 33 |
| 1983-09-25 | vs SEA | 157 | L 1-2 | 75-82 | 3 | 5,787 | Charlie Hough | Bob Stoddard | Bob Stoddard | Charlie Hough | Bill Caudill | 624 | 592 | 32 |
| 1983-09-27 | @ MIN | 158 | W 6-1 | 76-82 | 3 | 3,000 | Mike Smithson | Albert Williams | Mike Smithson | Albert Williams | | 630 | 593 | 37 |
| 1983-09-28 | @ MIN | 159 | L 0-3 | 76-83 | 3 | 4,084 | Danny Darwin | Pete Filson | Pete Filson | Danny Darwin | Ron Davis | 630 | 596 | 34 |
| 1983-09-29 | @ MIN | 160 | L 0-2 | 76-84 | 3 | 4,395 | Dave Stewart | Ken Schrom | Ken Schrom | Dave Stewart | | 630 | 598 | 32 |
| 1983-09-30 | vs CAL | 161 | W 4-3 | 77-84 | 3 | 9,232 | Frank Tanana | Tommy John | Tom Henke | Doug Corbett | | 634 | 601 | 33 |
| 1983-10-01 | vs CAL | 162 | L 5-6 | 77-85 | 3 | 11,356 | Charlie Hough | Geoff Zahn | Bob Lacey | Odell Jones | John Curtis | 639 | 607 | 32 |
| 1983-10-02 | vs CAL | 163 | L 0-2 | 77-86 | 3 | 8,727 | Al Lachowicz | Steve Brown | Steve Brown | Al Lachowicz | | 639 | 609 | 30 |