| 2025 | Kevin Pillar (st), Donovan Solano (Sep 27 – 28) |
| 2024 | Travis Jankowski |
| 2023 | Travis Jankowski |
| 2022 | Jake Marisnick (st) |
| 2021 | Brock Holt |
| 2020 | Scott Heineman (until Sep 7) |
| 2019 | Nolan Fontana (st), Scott Heineman (Aug 2 onward) |
| 2018 | Ryan Rua |
| 2017 | Ryan Rua |
| 2016 | Ryan Rua |
| 2015 | Ryan Rua (until Sep 20) |
| 2014 | Daniel Bard (st), Donnie Murphy (Mar 31 – Jul 4), Ryan Rua (Aug 29 onward) |
| 2013 | Dave Anderson (1B coach) |
| 2012 | Dave Anderson (3B coach) |
| 2011 | Dave Anderson (3B coach) |
| 2010 | Dave Anderson (3B coach) |
| 2009 | Dave Anderson (3B coach) |
| 2008 | Chris Shelton (until Jun 24), Jason Ellison (Aug 8 – 24) |
| 2007 | Guillermo Quiroz (st, Sep 3 onward), Adam Melhuse (Jun 10 – 17), Jarrod Saltamacchia (Jul 31 – Aug 5) |
| 2006 | Adam Hydzu (st, Apr 23 – 26) |
| 2005 | DeMarlo Hale (1b coach) |
| 2004 | DeMarlo Hale (1b coach) |
| 2003 | Ryan Christenson |
| 2002 | Dave Burba (until Jul 28), Jason Hart (Aug 18 onward) |
| 2001 | Bo Porter (until Aug 7) |
| 2000 | Mike Simms (st) |
| 1999 | Mike Simms (st, Sep 19 onward) |
| 1998 | Mike Simms |
| 1997 | Dean Palmer (until Jul 25) |
| 1996 | Dean Palmer |
| 1995 | Dean Palmer |
| 1994 | Dean Palmer (until Aug 10) |
| 1993 | Dean Palmer |
| 1992 | Dean Palmer |
| 1991 | Dean Palmer (st, Jun 26 onward) |
| 1990 | Dean Palmer (st) |
| 1989 | Dean Palmer (st, Sep 1 onward) |
| 1988 | |
| 1987 | Mike Mason (until May 14), Bob Malloy (May 26 – Jun 1) |
| 1986 | Mike Mason |
| 1985 | Mike Mason |
| 1984 | Mike Mason |
| 1983 | Mike Mason (until Apr 13, Sep 15 onward) |
| 1982 | Lee Mazzilli (until Aug 8), Mike Mason (Sep 13 – 28) |
| 1981 | Leon Roberts (until Aug 11), Tom Poquette (Aug 12 onward) |
| 1980 | Dock Ellis (st), Ken Clay (Aug 16 – Sep 23) |
| 1979 | Larvell Blanks |
| 1978 | Dave May (st), Paul Mirabella (Jul 28 onward) |
| 1977 | Dave May |
| 1976 | Gene Clines |
| 1975 | Jim Merritt (until May 23) |
| 1974 | Jim Merritt |
| 1973 | Bill McNulty (st), Jim Shellenback (Sep 22 – 23) |
| 1972 | Jim Shellenback (until Jul 11) |
Washington Senators Years |
|
| 1971 | Jim Miles (st), Jim Shellenback (Apr 10 onward) |
| 1970 | Jim Hannan (st, May 1 onward) |
| 1969 | Jim Hannan |
| 1968 | Bob Priddy (st), Jim Hannan (May 24 onward) |
| 1967 | Bob Priddy (until Sep 21) |
| 1966 | Mike McCormick |
| 1965 | Don Loun (st), Mike McCormick |
| 1964 | Howie Koplitz (st, Apr 22 – May 12), Don Loun (Sep 23 & Oct 3 only) |
| 1963 | Jack Jenkins (st), Ron Moeller (Aug 15 – Sep 25) |
| 1962 | Pete Burnside |
| 1961 | Pete Burnside |
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