| 2025 | Michael Plassmeyer (st) |
| 2024 | Austin Pruitt (st, Apr 13 – 20) |
| 2023 | Glenn Otto (st, Jun 30 – Sep 4), Matt Bush (Sep 30 – Oct 1, dnp) |
| 2022 | Glenn Otto |
| 2021 | Jimmy Herget (st, Aug 2 – 7), Glenn Otto (Aug 27 – Sep 30) |
| 2020 | Tim Dillard (st1) |
| 2019 | David Carpenter (Jun 4, Aug 13 – 18) |
| 2018 | Jonathan Niese (st, until Mar 16), Yovani Gallardo (Jun 17 onward) |
| 2017 | Mike Hauschild (until Apr 19), Ernesto Frieri (Jun 18 – Jul 3), Jhan Martinez (Aug 16 – 26) |
| 2016 | Kyle Loshe (Jul 9 – 19) |
| 2015 | Lewis Brinson (st), Yovani Gallardo |
| 2014 | Aaron Poreda (st, Apr 19 – Jul 10) |
| 2013 | Jacob Brigham (st), Ben Rowen (st), Nick Tepesch (Apr 9 – Sep 13) |
| 2012 | Jacob Brigham (st) |
| 2011 | Seth McClung (st) |
| 2010 | Chris Ray (until Jun 25), Mark Lowe (Sep 29 – Oct 3) |
| 2009 | Doug Mathis (st, Jun 6 only), Jason Grilli (Jun 9 onward) |
| 2008 | Jason Davis (st), Taylor Teagarden (st), Doug Mathis (May 12 – Jun 15) |
| 2007 | Miguel Ojeda (st) |
| 2006 | Jamie Burke (st), Miguel Ojeda (Sep 13 onward) |
| 2005 | Chris Young |
| 2004 | Eric Sabel (st), Ryan Snare (Apr 20 – 25, dnp), Sam Narron (Jul 30 only), Ryan Snare (Aug 6 only), Chris Young (Aug 24 onward) |
| 2003 | Robert Ellis (st), Victor Santos (Jun 5 – Jul 11) |
| 2002 | John Rocker (until Jul 3) |
| 2001 | Brian Sikorski (st) |
| 2000 | Brian Sikorski (st, Aug 16 onward) |
| 1999 | Tony Fossas (st) |
| 1998 | Joe Hall (st), Tony Fossas (Sep 1 onward) |
| 1997 | Warren Morris (st) |
| 1996 | Kerry Lacy (st) |
| 1995 | Tony Bouton (st – replacement), Kerry Lacy (st) |
| 1994 | Perry Hill (if coach) |
| 1993 | Danny Leon (st) |
| 1992 | Bob Sebra (st), Danny Leon (Jun 6 – Aug 4) |
| 1991 | |
| 1990 | Charlie Hough |
| 1989 | Charlie Hough |
| 1988 | Charlie Hough |
| 1987 | Charlie Hough |
| 1986 | Charlie Hough (st, May 6 onward) |
| 1985 | Charlie Hough |
| 1984 | Charlie Hough |
| 1983 | Charlie Hough |
| 1982 | Charlie Hough |
| 1981 | Charlie Hough |
| 1980 | Charlie Hough (Jul 12 onward) |
| 1979 | Jackie Brown (coach) |
| 1978 | Bob Babcock (st) |
| 1977 | John Poloni (st, Sep 16 – Oct 2) |
| 1976 | Bill Hands (st) |
| 1975 | Art Fowler (coach, st), Randy Fairbanks (st), Bill Hands (Apr 11 – Aug 10) |
| 1974 | Art Fowler (coach, st), Bill Hands (Sep 9 – 29) |
| 1973 | |
| 1972 | |
Washington Senators Years |
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| 1971 | |
| 1970 | |
| 1969 | |
| 1968 | |
| 1967 | |
| 1966 | |
| 1965 | |
| 1964 | |
| 1963 | |
| 1962 | |
| 1961 | |
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