| 2025 | Jack Leiter |
| 2024 | Jack Leiter (Apr 18 – May 14, Aug 28 onward) |
| 2023 | Jacob Barnes (st), Chris Stratton (Aug 2 onward) |
| 2022 | Kohei Arihara (st, Aug 16 – Sep 10) |
| 2021 | Kohei Arihara (until Sep 15) |
| 2020 | Lance Lynn (st, Jul 24 onward) |
| 2019 | Lance Lynn |
| 2018 | Cole Freakin’ Hamels (until Jul 23) |
| 2017 | Cole Freakin’ Hamels |
| 2016 | Cole Freakin’ Hamels |
| 2015 | Phil Klein (until Jul 28), Cole Hamels (Jul 31 onward) |
| 2014 | Jim Adduci |
| 2013 | Neil Ramirez (st), Jim Adduci (Sep 1 onward) |
| 2012 | Neil Ramirez (st) |
| 2011 | Tommy Hunter (until Jul 29) |
| 2010 | Tommy Hunter (st, Jun 5 onward) |
| 2009 | Tommy Hunter (st, May 29 onward) |
| 2008 | Chris Stewart (st), Sydney Ponson (Apr 26 – Jun 4), Tommy Hunter (Aug 1 – 14) |
| 2007 | Chris Stewart (until Jun 8), Bill White (Sep 5 onward) |
| 2006 | Ryan Bukvich (st) |
| 2005 | Ryan Bukvich (until Apr 16) , John Wetteland (roaving pitching coach) |
| 2004 | Herbert Perry (until Sep 10), John Wetteland (roaving pitching coach) |
| 2003 | Herbert Perry (until May 28), John Wetteland (roaving pitching coach) |
| 2002 | Herbert Perry |
| 2001 | Tim Crabtree (until Jun 25) |
| 2000 | John Wetteland (until Sep 20) |
| 1999 | John Wetteland |
| 1998 | John Wetteland |
| 1997 | John Wetteland |
| 1996 | Erik Pappas (st) |
| 1995 | Dan Smith (st) |
| 1994 | Dan Smith (st, Jun 7 – Jul 8) |
| 1993 | Dan Smith (st) |
| 1992 | Tom House (pitching coach) |
| 1991 | Tom House (pitching coach) |
| 1990 | Tom House (pitching coach) |
| 1989 | Tom House (pitching coach) |
| 1988 | Tom House (pitching coach) |
| 1987 | Tom House (pitching coach) |
| 1986 | Tom House (pitching coach) |
| 1985 | Greg Harris (st), Tom House (pitching coach – May 25 onward) |
| 1984 | Tom Henke |
| 1983 | Tom Henke (st, Aug 14 onward) |
| 1982 | Bob Lacey (st), Randy Bass (May 18 – Jun 7), Jim Farr (Sep 7 only), Tom Henke (Sep 10 onward) |
| 1981 | Adrian Devine (st), Bob Lacey (Sep 15 only) |
| 1980 | Adrian Devine (until Jul 3) |
| 1979 | Mike Jorgensen |
| 1978 | Mike Jorgensen (Apr 12 onward) |
| 1977 | Adrian Devine |
| 1976 | Steve Barr |
| 1975 | Ron Pruitt (st, Jun 25 onward) |
| 1974 | Joe Lovitto (st) |
| 1973 | Joe Lovitto (until Jun 10), Rick Henninger (Sep 3 – 24) |
| 1972 | Joe Lovitto |
Washington Senators Years |
|
| 1971 | Gary Ratliff (st), Richie Scheinblum (Apr 7 – May 16) |
| 1970 | Hank Allen (until May 10), Dick Billings (Sep 12 – 30) |
| 1969 | Hank Allen |
| 1968 | Sam Bowens (st, Apr 11 – Jul 16), Hank Allen (Apr 18 – Sep 29) |
| 1967 | Pete Craig (st) |
| 1966 | Pete Craig (st, Sep 24 only) |
| 1965 | Dallas Green (Apr 18 – May 7), Pete Craig (st, Sep 6 – 28) |
| 1964 | Fred Valentine (st), Buster Narum (wore 34, 35, & 20 – dates ???), Pete Craig (Oct 4 only) |
| 1963 | Herman Rathman (st) |
| 1962 | Leroy Heiser (st) |
| 1961 | Tom Sturdivant (until Jun 24) |
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