| 2023 | Glenn Otto |
| 2022 | Glenn Otto |
| 2021 | Jimmy Herget (st, Aug 2-12), Glenn Otto (Aug 27 onwards) |
| 2020 | Tim Dillard (st1) |
| 2019 | David Carpenter (May 31 – Jun 7) |
| 2018 | Jonathan Niese (st, released Mar 16), Yovani Gallardo (Jun 17 onwards) |
| 2017 | Mike Hauschild (until Apr 20), Ernesto Frieri (Jun 17 – Jul 3), Jhan Martinez (Aug 11 onwards) |
| 2016 | Kyle Loshe (Jul 9-27) |
| 2015 | Lewis Brinson (st), Yovani Gallardo |
| 2014 | Aaron Poreda |
| 2013 | Jacob Brigham (st), Ben Rowen (st), Nick Tepesch (Apr 9 onwards) |
| 2012 | Jacob Brigham (st) |
| 2011 | Seth McClung (st) |
| 2010 | Chris Ray (until Jun 30), Mark Lowe (Jul 9 onwards) |
| 2009 | Doug Mathis (Jun 3 – Jun 8), Jason Grilli (Jun 9 onwards) |
| 2008 | Jason Davis (st), Taylor Teagarden (st), Doug Mathis (May 11 onwards) |
| 2007 | Miguel Ojeda (minors) |
| 2006 | Jamie Burke (st), Miguel Ojeda (Sep 3 onwards) |
| 2005 | Chris Young |
| 2004 | Eric Sabel (st), Ryan Snare (Apr 20-25), Sam Narron (Jul 30 only), Ryan Snare (Aug 5-6), Chris Young (Aug 24 onwards) |
| 2003 | Robert Ellis (st), Victor Santos (Jun 5-Jul 17) |
| 2002 | John Rocker |
| 2001 | Brian Sikorski (st) |
| 2000 | Brian Sikorski |
| 1999 | |
| 1998 | Tony Fossas |
| 1997 | |
| 1996 | |
| 1995 | Tony Bouton (st – replacement) |
| 1994 | |
| 1993 | |
| 1992 | Danilo Leon |
| 1991 | |
| 1990 | Charlie Hough |
| 1989 | Charlie Hough |
| 1988 | Charlie Hough |
| 1987 | Charlie Hough |
| 1986 | Charlie Hough |
| 1985 | Charlie Hough |
| 1984 | Charlie Hough |
| 1983 | Charlie Hough |
| 1982 | Charlie Hough |
| 1981 | Charlie Hough |
| 1980 | Charlie Hough |
| 1979 | |
| 1978 | |
| 1977 | |
| 1976 | |
| 1975 | Bill Hands |
| 1974 | Bill Hands |
| 1973 | |
| 1972 | |
Washington Senators Years |
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| 1971 | |
| 1970 | |
| 1969 | |
| 1968 | |
| 1967 | |
| 1966 | |
| 1965 | |
| 1964 | |
| 1963 | |
| 1962 | |
| 1961 | |
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