| 2023 | Sam Huff (st, May 11 – Sep 17) |
| 2022 | Sam Huff (st, Apr 30 onward) |
| 2021 | Sam Huff (st) |
| 2020 | Kyle Bird (st1) |
| 2019 | Michael Tonkin (st), Kyle Bird (until Jul 30) |
| 2018 | Matt Moore |
| 2017 | Allen Webster (st), Willie Calhoun (Sep 12 onward) |
| 2016 | Cesar Ramos (until Jul 10) |
| 2015 | Roman Mendez (until May 3) |
| 2014 | Roman Mendez (st, Jul 7 onward) |
| 2013 | Roman Mendez (st), Ross Wolf (May 22 – Sep 13) |
| 2012 | Roman Mendez (st) |
| 2011 | Ryan Tucker (st), Mason Tobin (Apr 2 – 19), Merkin Valdez (Sep 2 – 25) |
| 2010 | Willie Eyre (st) |
| 2009 | Willie Eyre |
| 2008 | Robinson Tejeda (until Jun 15) |
| 2007 | Robinson Tejeda (until Jul 22) |
| 2006 | Robinson Tejeda (May 2 onward) |
| 2005 | Orel Hershiser (pitching coach) |
| 2004 | Orel Hershiser (pitching coach) |
| 2003 | Orel Hershiser (pitching coach) |
| 2002 | Orel Hershiser (pitching coach, Jun 22 onward) |
| 2001 | Pete Munro (st), Chris Michalak (Aug 24 onward) |
| 2000 | Jason Grabowski (st), Randy Knorr (Sep 6 onward) |
| 1999 | Corey Lee (st) |
| 1998 | Scott Sheldon (st) |
| 1997 | RA Dickey (st), Wilson Heredia (Aug 19 – Sep 20) |
| 1996 | Balvino Galvez (st), Wilson Heredia (st) |
| 1995 | Jack Kimel (st replacement), Wilson Heredia (until May 14) |
| 1994 | Jim McNamara (st) |
| 1993 | Kurt Miller (st) |
| 1992 | Brian Downing |
| 1991 | Ivan Rodriguez (st), Brian Downing |
| 1990 | Ray Hayward (st) |
| 1989 | Gary Lucas (st) |
| 1988 | |
| 1987 | |
| 1986 | Jose Mota (st) |
| 1985 | Bob Sebra (st) |
| 1984 | Mike Jirschele (st) |
| 1983 | Jerry Neufang (st) |
| 1982 | Walt Terrell (st) |
| 1981 | |
| 1980 | |
| 1979 | |
| 1978 | |
| 1977 | |
| 1976 | |
| 1975 | Joe Klein (st coach) |
| 1974 | Rick Kemp (st) |
| 1973 | |
| 1972 | Hal King (st) |
Washington Senators Years |
|
| 1971 | Charlie Walters (Apr 11 – May 14) |
| 1970 | |
| 1969 | |
| 1968 | |
| 1967 | |
| 1966 | |
| 1965 | |
| 1964 | |
| 1963 | |
| 1962 | |
| 1961 | |
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