| 2023 | Elier Hernandez (st) |
| 2022 | Dan Winkler (st), Elier Hernandez (Jul 14 – Aug 15) |
| 2021 | Tyson Ross (st), DJ Peters (Aug 2 onward) |
| 2020 | Danny Santana (until Aug 26) |
| 2019 | Danny Santana (st, Apr 13 onward) |
| 2018 | Doug Fister (until Jun 8) |
| 2017 | Steven Lerud (st), Pete Kozma (May 2 – Jul 18), Paolo Espino (Sep 2 onward) |
| 2016 | Chris Gimenez (st), Lucas Harrell (Jul 31 – Aug 16) |
| 2015 | Chris Gimenez (Jul 31 onward) |
| 2014 | Ron Washington (Manager until Sep 4, resigned) |
| 2013 | Ron Washington (Manager) |
| 2012 | Ron Washington (Manager) |
| 2011 | Ron Washington (Manager) |
| 2010 | Ron Washington (Manager) |
| 2009 | Ron Washington (Manager) |
| 2008 | Ron Washington (Manager) |
| 2007 | Eric Gagne (until Jul 31), Ron Washington (manager, Aug 6 onward) |
| 2006 | Kevin Walker (st), Edison Volquez (Aug 7 onward, used Edison and not Edinson at this time) |
| 2005 | Ryan Drese (until Jun 7), Justin Thompson (Aug 16 – 25) |
| 2004 | Ryan Drese |
| 2003 | Aaron Fultz |
| 2002 | Aaron Myette (st, Jun 9 onward) |
| 2001 | Ryan Glynn (until Jul 3) |
| 2000 | Ryan Glynn (st, Jun 5 onward) |
| 1999 | Ruben Mateo (st, Jun 12th only), Ryan Glynn (Jun 13 – Aug 13) |
| 1998 | Scott Klingenbeck (st) |
| 1997 | Fernando Tatis (st) |
| 1996 | Terry Burrows (st) |
| 1995 | Jackie Davidson (st replacement), Terry Burrows (until Jul 28) |
| 1994 | Don Wakamatsu (st), Terry Burrows (Jun 12 only) |
| 1993 | Bob Patterson |
| 1992 | Terry Mathews |
| 1991 | Craig McMurty (st), Terry Mathews (Sep 7 onward) |
| 1990 | Craig McMurty |
| 1989 | Craig McMurty |
| 1988 | Craig McMurty (st, Jun 1 onward) |
| 1987 | Ron Meridith (st, May 8 – Jun 5) |
| 1986 | Ricky Wright (st, Apr 10 – Aug 5), Ron Meridith (Sep 12 onward) |
| 1985 | Ricky Wright (st, Sep 10 onward) |
| 1984 | Ricky Wright |
| 1983 | Terry Bogener (st), Ricky Wright (Sep 30 only) |
| 1982 | John Henry Johnson (st), Terry Bogener (Jun 14 onward) |
| 1981 | John Henry Johnson (until Aug 31) |
| 1980 | John Henry Johnson (st, Jul 3 onward) |
| 1979 | Sparky Lyle (st), John Henry Johnson (Jun 19 onward) |
| 1978 | Don Bright (st) |
| 1977 | Tommy Boggs (st) |
| 1976 | Tommy Boggs (Jul 19 onward) |
| 1975 | Tom Robson (st, Jul 17 onward), Clyde Wright (unknown dates, cannot resolve conflict) |
| 1974 | Tommy Cruz (st), Tom Robson (Sep 14 onward) |
| 1973 | Rick Stelmaszek (Apr 17 – May 19), Bill Madlock (Sep 7 onward) |
| 1972 | |
Washington Senators Years |
|
| 1971 | Jeff Burroughs (st) |
| 1970 | Dave Nelson |
| 1969 | Bill Gogolewski (st) |
| 1968 | Tom Grieve (st) |
| 1967 | Jack Jenkins (st), Casey Cox, Dick Nold (Aug 19 – Sep 21), Buster Narum (Sep 20 – 26) |
| 1966 | Tim Cullen |
| 1965 | John Shew (st) |
| 1964 | |
| 1963 | Eddie Brinkman (st) |
| 1962 | Eddie Brinkman, Carl Bouldin (st, Apr 26, Jun 8-22, Sep 15-21) |
| 1961 | |
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