Although the Mariners are only saying Jim Riggleman is the manager for the remainder of the season, he is being considered the team’s 13th full-time manager. Only one of his predecessors has managed a winning career record with the team.
| Manager | Years | W-L | Pct. |
| Darrell Johnson | 1977-80 | 226-362 | .384 |
| Maury Wills | 1980-81 | 26-56 | .317 |
| Rene Lachemann | 1981-83 | 140-180 | .438 |
| Del Crandell | 1983-84 | 93-131 | .415 |
| Chuck Cottier | 1984-86 | 98-119 | .452 |
| Marty Martinez* | 1986 | 0-1 | .000 |
| Dick Williams | 1986-88 | 159-192 | .453 |
| Jim Snyder* | 1988 | 45-60 | .429 |
| Jim Lefebvre | 1989-91 | 233-253 | .479 |
| Bill Plummer | 1992 | 64-98 | .395 |
| Lou Piniella | 1993-2002 | 840-711 | .542 |
| Bob Melvin | 2003-04 | 156-168 | .481 |
| Mike Hargrove | 2005-07 | 192-210 | .478 |
| John McLaren | 2007-08 | 68-88 | .436 |
| Jim Riggleman | 2008 | 0-0 | .000 |
* Interim
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