| 2021 | Sam Gaviglio (st), Yohel Pozo (Aug 13 onward) |
| 2020 | Ariel Jurado (st), Tony Beasley (3B coach) |
| 2019 | Tony Beasley (3B coach) |
| 2018 | Shawn Tolleson (st) |
| 2017 | Jason Grilli (Jul 3 onwards) |
| 2016 | Shawn Tolleson |
| 2015 | Shawn Tolleson |
| 2014 | Shawn Tolleson |
| 2013 | Kyle McClellan (Jun 9 – Jul 2) |
| 2012 | Mike Adams |
| 2011 | Eric Hurley (st), Mike Adams (Aug 2 onwards) |
| 2010 | Eric Hurley (st) |
| 2009 | Kris Benson (until Jun 9) |
| 2008 | Eric Hurley (Jun 12 – Jul 27), Jason Ellison (Aug 8 – Aug 24) |
| 2007 | Ron Washington (until Aug 5) |
| 2006 | Jose Silva (st), Bryan Corey (Jun 9 onwards) |
| 2005 | Kenny Rogers |
| 2004 | Kenny Rogers |
| 2003 | Ryan Drese |
| 2002 | Kenny Rogers |
| 2001 | Kenny Rogers |
| 2000 | Kenny Rogers |
| 1999 | Ricky Williams (yes, that Ricky Williams), Corey Lee |
| 1998 | Bill Haselman |
| 1997 | Mark Sagmoen (Apr 16 onwards) |
| 1996 | Gil Heredia |
| 1995 | Kenny Rogers |
| 1994 | Kenny Rogers |
| 1993 | Kenny Rogers |
| 1992 | Kenny Rogers |
| 1991 | Kenny Rogers |
| 1990 | Kenny Rogers |
| 1989 | Kenny Rogers |
| 1988 | Jose Cecena |
| 1987 | |
| 1986 | |
| 1985 | |
| 1984 | |
| 1983 | |
| 1982 | |
| 1981 | |
| 1980 | Rich Donnelly (coach) |
| 1979 | Larry McCall |
| 1978 | |
| 1977 | Mike Bacsik |
| 1976 | |
| 1975 | |
| 1974 | Bill Fahey |
| 1973 | Don Shields (st), Don Castle (Sep 11 – 29) |
| 1972 | Elliott Maddox (st), Jan Dukes |
Washington Senators Years |
|
| 1971 | Elliott Maddox |
| 1970 | Ron Law (st) |
| 1969 | Dave Baldwin |
| 1968 | Dave Baldwin |
| 1967 | Joe Coleman (st), Dave Baldwin |
| 1966 | Joe Coleman (Sep 26 only) |
| 1965 | Jim Bronstad (st), Jim French |
| 1964 | Ed Roebuck (until Apr 19), Jim Bronstad (Sep 16 – Oct 4) |
| 1963 | Jimmy Piersall (Apr 8 – May 22), Ed Roebuck |
| 1962 | Jimmy Piersall |
| 1961 | |
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