| 2023 | Martin Perez |
| 2022 | Tim Hyers (hitting coach, st), Martin Perez |
| 2021 | Kyle Cody |
| 2020 | Derek Law (st2, Jul 16 onward) |
| 2019 | Jeffrey Springs |
| 2018 | Jeffrey Springs (Jul 31 onward) |
| 2017 | Andrew Cashner |
| 2016 | Tom Wilhelmsen (until Jun 13) |
| 2015 | Matt Harrison (st, Jul 8 – 27) |
| 2014 | Matt Harrison (until May 13) |
| 2013 | Matt Harrison (until Apr 6) |
| 2012 | Matt Harrison |
| 2011 | Matt Harrison |
| 2010 | Matt Harrison |
| 2009 | Matt Harrison (until Jun 23) |
| 2008 | Franklyn German (until May 22), Matt Harrison (Jul 8 – Sep 24) |
| 2007 | Franklyn German (st) |
| 2006 | Erasmo Ramirez (st) |
| 2005 | Erasmo Ramirez (Jul 15 onward) |
| 2004 | Erasmo Ramirez |
| 2003 | Travis Hughes (st), Erasmo Ramirez (Apr 26 onward) |
| 2002 | Chris Michalak (until May 26) |
| 2001 | Jovanny Cedeno (st) |
| 2000 | Mark Clark (until Jul 1) |
| 1999 | Mark Clark (until Jun 19) |
| 1998 | Danny Kolb (st) |
| 1997 | Andrew Vessel (st) |
| 1996 | Chris Nichting (st) |
| 1995 | Rob Wishnevski (st replacement), Chris Nichting (st, May 15 – Aug 16) |
| 1994 | Ken Howell (st) |
| 1993 | Terry Bross (st) |
| 1992 | Cris Colon (st, Sep 18 onward) |
| 1991 | Don Harris (st), Goose Gossage |
| 1990 | Don Harris (st) |
| 1989 | Paul Wilmet (st, Jul 25 – 29) |
| 1988 | DeWayne Vaughn (until Jul 4) |
| 1987 | |
| 1986 | |
| 1985 | Mike Rubel (st) |
| 1984 | Brad Mengwasser (st) |
| 1983 | Dan Boitano (st) |
| 1982 | Dan Boitano (st, Jul 8 onward) |
| 1981 | Dave Schmidt (st) |
| 1980 | |
| 1979 | Stan Jakubowski (st) |
| 1978 | Sid Hudson (coach) |
| 1977 | Sid Hudson (coach) |
| 1976 | Sid Hudson (coach) |
| 1975 | Sid Hudson (st coach) |
| 1974 | Larry Gura (st) |
| 1973 | |
| 1972 | Don Castle (st) |
Washington Senators Years |
|
| 1971 | Jim Southworth (st) |
| 1970 | Tom Ragland (st) |
| 1969 | Tom Grieve (st) |
| 1968 | Bob Parchem (st) |
| 1967 | Dick Such (Listed as “In Military Service”) |
| 1966 | |
| 1965 | Jay Walrath (st) |
| 1964 | Steve Schroer (st) |
| 1963 | |
| 1962 | |
| 1961 | |
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