| 2025 | Cole Winn (st, May 16 onward) |
| 2024 | Cole Winn (st, Apr 14 onward) |
| 2023 | Cole Winn (st) |
| 2022 | Meibrys Viloria (st, Jun 21 – Aug 23), Dallas Keuchel (Aug 27 & Sep 2) |
| 2021 | John King (until Jul 6) |
| 2020 | Luke Farrell (st, Jul 25 – Sep 12) |
| 2019 | Luke Farrell (st, Aug 23 – Sep 28) |
| 2018 | Erik Goeddel (st), Carlos Perez (May 6 onward) |
| 2017 | Anthony Bass (st, Apr 25 & May 3) |
| 2016 | Jayce Tingler (ML field coordinator) |
| 2015 | Jayce Tingler (ML field coordinator) |
| 2014 | Nate Adcock (st), Chris Gimenez (Mar 31 dnp, May 20 – Aug 3), Guilder Rodriguez (Sep 9 – 23) |
| 2013 | Coty Woods (st) |
| 2012 | Fabio Castillo (st) |
| 2011 | Fabio Castillo (st) |
| 2010 | Warner Madrigal (st) |
| 2009 | Warner Madrigal (st, Apr 10 – Sep 24) |
| 2008 | Warner Madrigal (st, Jul 2 onward) |
| 2007 | Willie Eyre (st) |
| 2006 | Nick Trzesniak (st) |
| 2005 | Jason Standridge (st) |
| 2004 | Danny Ardoin (st), Bobby Jones (September only coach) |
| 2003 | R.A. Dickey (st), Bob Missick (Sep 1-3; roaving minor league scout/coach) |
| 2002 | R.A. Dickey (st) |
| 2001 | |
| 2000 | |
| 1999 | |
| 1998 | Julio Santana (until Apr 11) |
| 1997 | Julio Santana |
| 1996 | Julio Santana (st) |
| 1995 | Bert Gerhart (st replacement), Julio Santana (st) |
| 1994 | Julio Santana (st) |
| 1993 | Steve Fireovid (st) |
| 1992 | Kevin Blankenship (st) |
| 1991 | Dan Smith (st) |
| 1990 | Jose Cecena (st) |
| 1989 | |
| 1988 | |
| 1987 | Dave Oliver (coach) |
| 1986 | Dave Oliver (coach) |
| 1985 | |
| 1984 | Dave Oliver (st coach) |
| 1983 | Dave Oliver (st coach) |
| 1982 | |
| 1981 | |
| 1980 | |
| 1979 | |
| 1978 | |
| 1977 | Rich Donnelly (st coach) |
| 1976 | Rich Donnelly (st coach) |
| 1975 | Rich Donnelly (st coach) |
| 1974 | |
| 1973 | Bill Jurges (coach) |
| 1972 | |
Washington Senators Years |
|
| 1971 | |
| 1970 | Jackie Brown (st) |
| 1969 | |
| 1968 | |
| 1967 | |
| 1966 | |
| 1965 | |
| 1964 | |
| 1963 | |
| 1962 | |
| 1961 | |
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