| 2025 | Jonathan Ornelas (st, Mar 30 onward) |
| 2024 | Danny Duffy (st) |
| 2023 | Danny Duffy (st) |
| 2022 | Grant Anderson (st) |
| 2021 | Jordan Lyles |
| 2020 | Jordan Lyles |
| 2019 | Hunter Pence (until Aug 22) |
| 2018 | Steve Buechele (1B coach, until Mar 19), Anthony Iapoce (hitting coach) |
| 2017 | Steve Buechele (Bench coach) |
| 2016 | Steve Buechele (Bench coach) |
| 2015 | Steve Buechele (Bench coach) |
| 2014 | Gary Pettis (3B coach), Spike Owen (3B coach, May 30 – Jun 1 only) |
| 2013 | Gary Pettis (3B coach) |
| 2012 | Gary Pettis (1B coach) |
| 2011 | Gary Pettis (1B coach) |
| 2010 | Gary Pettis (1B coach) |
| 2009 | Gary Pettis (1B coach) |
| 2008 | Gary Pettis (1B coach) |
| 2007 | Gary Pettis (1B coach) |
| 2006 | Adrian Brown (until May 23) |
| 2005 | Adrian Gonzalez |
| 2004 | Adrian Gonzalez |
| 2003 | Jermaine Clark (until Apr 14, Sep 9 onward – traded away and back in middle) |
| 2002 | Oscar Acosta (pitching coach, until Jun 20), Ruben Rivera (Jul 11 onward) |
| 2001 | Ruben Sierra |
| 2000 | Mike Lamb (st), David Segui (Apr 3 – Jul 27) |
| 1999 | Tom Goodwin |
| 1998 | Tom Goodwin |
| 1997 | Mike Devereaux (until Jun 6), Tom Goodwin (Jul 27 onward) |
| 1996 | Craig Worthington (until May 14), Jack Voigt (Sep 12 – 29) |
| 1995 | Steve Dreyer (st), Steve Buechele (Jul 17 – 29), Craig Worthington (Aug 17 onward) |
| 1994 | Steve Dreyer (until Apr 30) |
| 1993 | Ray Stephens (st), Steve Dreyer (Aug 8 onward) |
| 1992 | Gary Pettis (st), Mike Campbell (May 7 only), Ray Stephens (Aug 1 onward) |
| 1991 | Gary Pettis |
| 1990 | Gary Pettis |
| 1989 | Darrel Akerfelds (st, May 31, Sep 3 onward) |
| 1988 | Steve Kemp (until May 24) |
| 1987 | Jeff Zaske (st) |
| 1986 | Kenny Rogers (st), Ricky Wright (Apr 10 – Aug 5) |
| 1985 | Dave Schmidt |
| 1984 | Dave Schmidt (until Sep 13) |
| 1983 | Dave Schmidt (st, May 1 – Sep 15) |
| 1982 | Dave Schmidt (until Sep 5) |
| 1981 | Rick Lisi (st), Dave Schmidt (May 1 onward) |
| 1980 | Ed Figueroa (Aug 2 onward) |
| 1979 | Brian Allard (st), Willie Montanez (Aug 13 onward) |
| 1978 | Gary Gray (st), Bobby Cuellar (st), Bobby Bonds (May 18 onward) |
| 1977 | Gary Gray (st, Jun 23 only), Mike Wallace (Apr 13 – 24) |
| 1976 | Mike Kekich (st) |
| 1975 | Art DeFilippis (st) |
| 1974 | Pete Mackanin (st, Oct 1 – 2) |
| 1973 | Steve Lawson (st), Pete Mackanin (Jul 3 onward) |
| 1972 | Mike Thompson (st), Steve Lawson (Aug 3 onward) |
Washington Senators Years |
|
| 1971 | Jackie Brown (st), Mike Thompson (May 19 – Sep 17) |
| 1970 | Jim Miles (st), Greg Goossen (Aug 18 onward) |
| 1969 | Frank Bertaina (until Jun 11), Jim Miles (Jul 19 – Sep 9) |
| 1968 | Frank Bertaina |
| 1967 | Pete Richert (until May 28), Frank Bertaina (Jun 5 onward) |
| 1966 | Pete Richert |
| 1965 | Pete Richert |
| 1964 | Claude Osteen |
| 1963 | Claude Osteen |
| 1962 | Héctor Maestri (st), Claude Osteen (Sep 5 – 19) |
| 1961 | Carl Mathias (Jun 18 – Jul 14), Héctor Maestri (Sep 17 only) |
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