| 2023 | Adolis Garcia |
| 2022 | Adolis Garcia |
| 2021 | Adolis Garcia (st, Apr 13 onward) |
| 2020 | Adolis Garcia (st, Jul 28 onward) |
| 2019 | Jesse Chavez |
| 2018 | Jesse Chavez (till Jul 18) |
| 2017 | Michael Wagner (st), A.J. Jimenez (Sep 1 onward) |
| 2016 | Anthony Ranaudo (until May 10), Michael Roth (Jul 4 only) |
| 2015 | Luke Jackson (st, Sep 4 onward) |
| 2014 | Wilmer Font (st) |
| 2013 | Wilmer Font (st, Jul 12 – 14) |
| 2012 | Matthew West (st), Wilmer Font (Sep 18 – 28) |
| 2011 | Arthur Rhodes (until Aug 1) |
| 2010 | Johnny Narron (Hamilton accountability coach) |
| 2009 | Joaquin Benoit (st) |
| 2008 | Joaquin Benoit |
| 2007 | Joaquin Benoit |
| 2006 | Joaquin Benoit |
| 2005 | Joaquin Benoit (st, May 6 onward) |
| 2004 | Joaquin Benoit |
| 2003 | Joaquin Benoit (st, May 2 onward) |
| 2002 | Joaquin Benoit (st, May 9 onward) |
| 2001 | Joaquin Benoit (st, Aug 8 only) |
| 2000 | Joaquin Benoit (st) |
| 1999 | Eric Gunderson (until May 7) |
| 1998 | Eric Gunderson |
| 1997 | Eric Gunderson |
| 1996 | Mark Mimbs (st) |
| 1995 | Felipe Castillo (st – replacement) |
| 1994 | Terry Burrows (st) |
| 1993 | Terry Burrows (st) |
| 1992 | Dan Peltier (st, Jun 26 – 29, Sep 16 onward) |
| 1991 | Dan Peltier (st) |
| 1990 | Dan Peltier (st) |
| 1989 | John Gibbons (st) |
| 1988 | Ed Correa (st) |
| 1987 | Ed Correa (until Jul 5) |
| 1986 | Scott Patterson (st), Chad Kreuter (st) |
| 1985 | Mitch Williams (st) |
| 1984 | Mike Griffin (st), Joey McLaughlin (Jun 2 onward) |
| 1983 | John Pacella (st) |
| 1982 | Mark Mercer (st) |
| 1981 | Willie Horton (st), Mark Mercer (Sep 1 – Sep 28) |
| 1980 | |
| 1979 | Odie Davis (st) |
| 1978 | Mike Jorgensen (st) |
| 1977 | Bobby Cuellar (st, Sep 9 -20) |
| 1976 | Jonathan Astroth (st) |
| 1975 | Dave Moharter (st) |
| 1974 | Dave Moharter (st) |
| 1973 | |
| 1972 | Pete Mackanin (st) |
Washington Senators Years |
|
| 1971 | |
| 1970 | Larry Biittner (st) |
| 1969 | Bob Saverine (st) |
| 1968 | Jim Miles (st) |
| 1967 | John Shew (st) |
| 1966 | Rich Nold (st) |
| 1965 | Harry Dahl (st) |
| 1964 | Casey Cox (st) |
| 1963 | |
| 1962 | |
| 1961 | |
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