| 2025 | Jon Gray (Jul 23 – Aug 16) |
| 2024 | Jon Gray |
| 2023 | Jon Gray |
| 2022 | Jon Gray |
| 2021 | Don Wakamatsu (bench coach) |
| 2020 | Don Wakamatsu (bench coach) |
| 2019 | Don Wakamatsu (bench coach) |
| 2018 | Steve Buechele (1B coach, Mar 20 onward) |
| 2017 | Nick Martinez (st, Apr 22 – Sep 27) |
| 2016 | Nick Martinez (st, Apr 23 – Sep 25) |
| 2015 | Nick Martinez |
| 2014 | Rafael Perez (st), Nick Martinez (Apr 5 onward) |
| 2013 | Yoshinori Tateyama (st), Matt Garza (Jul 24 onward) |
| 2012 | Yoshinori Tateyama (st, May 21 onward) |
| 2011 | Yoshinori Tateyama (st, May 24 onward) |
| 2010 | Tanner Scheppers (st) |
| 2009 | Marlon Byrd |
| 2008 | Marlon Byrd |
| 2007 | Marlon Byrd (st, May 26 onward) |
| 2006 | David Dellucci (st) |
| 2005 | David Dellucci |
| 2004 | David Dellucci |
| 2003 | Justin Thompson (st), Todd Greene (Mar 30 onward) |
| 2002 | Justin Thompson (st), Hector Ortiz (May 4 – 15) |
| 2001 | Justin Thompson (st) |
| 2000 | Justin Thompson (st) |
| 1999 | |
| 1998 | Will Clark (until Sep 25) |
| 1997 | Will Clark (until Aug 24) |
| 1996 | Will Clark |
| 1995 | Will Clark |
| 1994 | Will Clark |
| 1993 | Doug Strange (st), Benji Gil (until May 26) |
| 1992 | Floyd Bannister (st), Jack Daugherty (Apr 6 onward) |
| 1991 | Steve Buechele (until Aug 30) |
| 1990 | Steve Buechele |
| 1989 | Steve Buechele |
| 1988 | Steve Buechele |
| 1987 | Steve Buechele |
| 1986 | Steve Buechele |
| 1985 | Merv Rettenmund (hitting coach), Steve Buechele (Jul 19 onward) |
| 1984 | Jim Bibby (until May 26) |
| 1983 | Merv Rettenmund (hitting coach) |
| 1982 | Darrell Johnson (coach) |
| 1981 | Rick Honeycutt |
| 1980 | Richie Zisk |
| 1979 | Richie Zisk |
| 1978 | Richie Zisk |
| 1977 | Tommy Boggs (Apr 13 – May 14), Pat Putnam (st, Sep 2 onward) |
| 1976 | Wayne Pinkerton (st), Doug Ault (Sep 9 – 26) |
| 1975 | Jim Bibby (until Jun 12) |
| 1974 | Jim Bibby |
| 1973 | Don Castle (st), Jim Bibby (Jun 16 onward) |
| 1972 | Ron Law (st), Jim Driscoll (Apr 23 – May 26) |
Washington Senators Years |
|
| 1971 | Jan Dukes (st) |
| 1970 | Jan Dukes (until Apr 22) |
| 1969 | Gene Martin (st), Frank Kreutzer (May 6 – 12), Jan Dukes (Sep 6 – 30) |
| 1968 | Dick Nold (st), Bill Denehy (Apr 13 – 26), Gene Martin (Jul 28 – Sep 13) |
| 1967 | Darold Knowles (st), Dick Nold (Aug 19 – Sep 21, maybe #38?) |
| 1966 | Barry Moore (st), Tom Cheney (Apr 26 – May 9), Dick Phillips (Jun 29 – Sep 25) |
| 1965 | Al Koch (st), Nick Willhite (Apr 18 – May 8), Marshall Bridges (May 16 – Sep 25) |
| 1964 | Jack Jenkins (st) |
| 1963 | Art Quirk (until May 22), Jack Jenkins (Sep 10 – Sep 27) |
| 1962 | Marty Kutyna |
| 1961 | Marty Kutyna |
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