| 2023 | Jose LeClerc |
| 2022 | Jose LeClerc |
| 2021 | Jose LeClerc |
| 2020 | Jose LeClerc |
| 2019 | Jose LeClerc |
| 2018 | Trevor Plouffe (st) |
| 2017 | Jonathan Lucroy (Until Jul 30), Jason Wood (3B coach, Sep 11 only) |
| 2016 | Justin Ruggiano (st, Apr 6 only), Jonathan Lucroy (Aug 2 onward) |
| 2015 | Jamey Wright (st), Wandy Rodriguez (Apr 24 to May 10), Mike Napoli (Aug 8 onward) |
| 2014 | Jose Contreras (st), Scott Baker (May 7 – Sep 27) |
| 2013 | Josh Lindblom (st, May 20 – Jul 10) |
| 2012 | Mike Napoli, Louis Brinson (contract signing press conference only) |
| 2011 | Mike Napoli |
| 2010 | Ryan Garko |
| 2009 | Andruw Jones |
| 2008 | Jarrod Saltamacchia (st, Apr 26 onward) |
| 2007 | Jerry Hairston, Jr (until Aug 5), Jarrod Saltamacchia (Aug 6 onward) |
| 2006 | Phil Nevin (until May 31), Jerry Hairston, Jr (Jun 2 onward) |
| 2005 | Marshall McDougall (Jun 7 – Jul 17), Phil Nevin (Jul 29 onward) |
| 2004 | |
| 2003 | Rafael Palmeiro |
| 2002 | Rafael Palmeiro |
| 2001 | Rafael Palmeiro |
| 2000 | Rafael Palmeiro |
| 1999 | Rafael Palmeiro |
| 1998 | Larry Hardy (bullpen coach) |
| 1997 | Larry Hardy (bullpen coach) |
| 1996 | Larry Hardy (bullpen coach) |
| 1995 | Larry Hardy (bullpen coach) |
| 1994 | James Hurst |
| 1993 | Rafael Palmeiro |
| 1992 | Rafael Palmeiro |
| 1991 | Rafael Palmeiro |
| 1990 | Rafael Palmeiro |
| 1989 | Buddy Bell (until Jun 17), Rafael Palmeiro (Jul 29 onward) |
| 1988 | Brad Arnsberg (st) |
| 1987 | |
| 1986 | Darrell Porter (st) |
| 1985 | Buddy Bell (until Jul 18) |
| 1984 | Buddy Bell |
| 1983 | Buddy Bell |
| 1982 | Buddy Bell |
| 1981 | Buddy Bell |
| 1980 | Buddy Bell |
| 1979 | Buddy Bell |
| 1978 | Paul Lindblad (until Jul 31) |
| 1977 | Mike Bacsik Sr. (st), Paul Lindblad |
| 1976 | Len Barker (st), Mike Bacsik Sr. (Jun 25 – Oct 2) |
| 1975 | Mark Tanner (st), Clyde Wright |
| 1974 | Jim Shellenback (st, May 1 – Jul 8) |
| 1973 | Rich Hand (until May 19), Rico Carty (until Jul 19) |
| 1972 | Rich Hand |
Washington Senators Years |
|
| 1971 | Mike Thompson, Frank Fernandez (May 12 – Jun 22) |
| 1970 | Bob Schroder (st) |
| 1969 | Barry Moore |
| 1968 | Barry Moore |
| 1967 | Barry Moore |
| 1966 | Brant Alyea (st), Alan Closter (Apr 19 only), Barry Moore (Jul 23 – Sep 25) |
| 1965 | Roy Sievers, Brant Alyea (Sep 11 – Oct 2) |
| 1964 | Marshall Bridges (Apr 15 – Jun 20), Pete Craig (Sep 6 – Oct 4) |
| 1963 | Don Lock (st), Bobo Osborne |
| 1962 | Dale Long, Don Lock |
| 1961 | Dale Long |
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