| 2023 | Mike Maddux (Pitching coach) |
| 2022 | Spencer Howard (until Jun 24) |
| 2021 | Ian Kennedy (until Jul 30), Spencer Howard (Jul 31 onward) |
| 2020 | Cody Allen (st) |
| 2019 | Chris Martin |
| 2018 | Chris Martin |
| 2017 | Jared Hoying (st, May 16 onward) |
| 2016 | Phil Klein (until May 5), Jared Hoying (Aug 2 onward) |
| 2015 | Mike Maddux (Pitching coach), Phil Klein (Aug 5 only – maybe?) |
| 2014 | Mike Maddux (Pitching coach) |
| 2013 | Mike Maddux (Pitching coach) |
| 2012 | Mike Maddux (Pitching coach) |
| 2011 | Mike Maddux (Pitching coach) |
| 2010 | Mike Maddux (Pitching coach) |
| 2009 | Mike Maddux (Pitching coach) |
| 2008 | Jason Jennings (until Apr 29) |
| 2007 | Edinson Volquez (st, Sep 1 onward) |
| 2006 | Francisco Cordero (until Jul 26), Kip Wells (Aug 2 – 11) |
| 2005 | Francisco Cordero |
| 2004 | Francisco Cordero |
| 2003 | Francisco Cordero |
| 2002 | Francisco Cordero |
| 2001 | Bobby Jones (1b coach) |
| 2000 | Pedro Valdes (st), Bobby Jones (May 9 onward, 1b coach) |
| 1999 | Mike Zwyica (st) |
| 1998 | Xavier Hernandez |
| 1997 | Xavier Hernandez (until Aug 1) |
| 1996 | Rudy Pemberton (st) |
| 1995 | Roger McDowell |
| 1994 | Cris Carpenter |
| 1993 | Robb Nen (until Jun 11), Cris Carpenter (st, Jul 18 onward) |
| 1992 | Tom Robson (hitting coach) |
| 1991 | Tom Robson (hitting coach) |
| 1990 | Tom Robson (hitting coach) |
| 1989 | Tom Robson (hitting coach) |
| 1988 | Tom Robson (dugout coach) |
| 1987 | Tom Robson (bullpen coach) |
| 1986 | Tom Robson (bullpen coach) |
| 1985 | Billy Taylor (st), Dale Murray (May 13 only) |
| 1984 | Dave Stewart |
| 1983 | Tim Henry (st), Dave Stewart (Aug 20 onward) |
| 1982 | Doug Flynn (st) |
| 1981 | Fergie Jenkins (until Sep 18) |
| 1980 | Fergie Jenkins |
| 1979 | Fergie Jenkins |
| 1978 | Fergie Jenkins |
| 1977 | Wayne Pinkerton (st), Mike Marshall |
| 1976 | Joe Hoerner (43 in season?) |
| 1975 | Fergie Jenkins |
| 1974 | Fergie Jenkins |
| 1973 | Steve Greenberg (st), Jackie Brown (Jul 9 onward) |
| 1972 | Norm McRae (st), Jim Panther |
Washington Senators Years |
|
| 1971 | Joe Grzenda |
| 1970 | Joe Grzenda, Cisco Carlos (Sep 15 – 27) |
| 1969 | Jim Miles (st), Sam Bowens, Cisco Carlos |
| 1968 | Bob Chance (st), Jim Miles |
| 1967 | Dave Baldwin, Bob Chance |
| 1966 | Howie Koplitz (Apr 24 only), Dave Baldwin (Sep 6 – Sep 26) |
| 1965 | Brant Alyea (st), Howie Koplitz, Joe McCabe |
| 1964 | Willie Kirkland |
| 1963 | Wayne Comer (st) |
| 1962 | Joe Hicks |
| 1961 | |
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