| 2025 | Corey Ragsdale (1B coach) |
| 2024 | Corey Ragsdale (1B coach) |
| 2023 | Corey Ragsdale (1B coach) |
| 2022 | Zack Reks (st), Corey Ragsdale (1B coach) |
| 2021 | Jonah Heim (st) |
| 2020 | Julio Rangel (pitching coach, st1), Doug Mathis (bullpen coach, st1), Jimmy Herget (st, Jul 31 onward) |
| 2019 | C.D. Pelham (st) |
| 2018 | Edinson Volquez (st), C.D. Pelham (Sep 5 onward) |
| 2017 | AJ Griffin |
| 2016 | AJ Griffin |
| 2015 | Antoan Richardson (st) |
| 2014 | Brad Snyder (st, Jun 10 – 22), Phil Klein (Aug 1 – Sep 24) |
| 2013 | Yonata Ortega (st) |
| 2012 | Greg Reynolds (st) |
| 2011 | Mason Tobin (st) |
| 2010 | Pedro Strop (st), Alexi Ogando (Jun 15 onward) |
| 2009 | Manny Pina (st), Pedro Strop (Aug 28 onward) |
| 2008 | Eric Hurley (st) |
| 2007 | Eric Hurley (st) |
| 2006 | Mike Nickeas (st) |
| 2005 | Wilfredo Rodriguez (st) |
| 2004 | Nick Regilio (st) |
| 2003 | Drew Meyer (st) |
| 2002 | Dan Murray (st) |
| 2001 | Dave Steed (st) |
| 2000 | Luis Taveras (st) |
| 1999 | Ryan Glynn (st) |
| 1998 | Ryan Glynn (st) |
| 1997 | |
| 1996 | |
| 1995 | Ritchie Moody (st) |
| 1994 | Ritchie Moody (st) |
| 1993 | Mark Lee (st) |
| 1992 | |
| 1991 | Barry Winford (st) |
| 1990 | Barry Winford (st) |
| 1989 | |
| 1988 | |
| 1987 | |
| 1986 | |
| 1985 | |
| 1984 | |
| 1983 | |
| 1982 | |
| 1981 | |
| 1980 | |
| 1979 | |
| 1978 | |
| 1977 | |
| 1976 | |
| 1975 | |
| 1974 | Joe Klein (st coach) |
| 1973 | |
| 1972 | |
Washington Senators Years |
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| 1971 | |
| 1970 | George Woodson (st) |
| 1969 | |
| 1968 | |
| 1967 | |
| 1966 | |
| 1965 | |
| 1964 | |
| 1963 | |
| 1962 | |
| 1961 | |
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