| 2023 | Andrew Heaney |
| 2022 | Justin Anderson (st) |
| 2021 | Kyle Gibson (until Jul 24) |
| 2020 | Kyle Gibson |
| 2019 | Tim Dillard (st), Jesse Biddle (Jul 2 – 14) |
| 2018 | Destin Hood (st until Mar 6), Tim Lincecum (Mar 7 – Jun 5, dnp), Cory Gearin (Jul 9 – Aug 30), Brandon Mann (Sep 29 only) |
| 2017 | Tyson Ross (st, Jun 16 – Sep 10) |
| 2016 | Spike Owen (Interim 3B coach) |
| 2015 | Spencer Patton (st, May 6 – Aug 26) |
| 2014 | Jason Frasor (until Jul 15), Jerome Williams (Jul 25 – Aug 1), Spencer Patton (Sep 4 onward) |
| 2013 | Jason Frasor |
| 2012 | Michael Kirkman (until Jun 12), Roy Oswalt (Jun 22 onward) |
| 2011 | Michael Kirkman |
| 2010 | Geoff Geary (st) |
| 2009 | Vicente Padilla (until Aug 6) |
| 2008 | Vicente Padilla |
| 2007 | Vicente Padilla |
| 2006 | Vicente Padilla |
| 2005 | Rosman Garcia (st), Jason Standridge (Jun 17-24), Jason Botts (Jul 17-18 dnp, Sep 12 onward) |
| 2004 | Carlos Almanzar (st), Todd Williams (st), Kameron Loe (Sep 26 – 29) |
| 2003 | Danny Kolb (st), Alan Benes (May 9 – Jun 3) |
| 2002 | Kelly Dransfeldt (st), Rich Rodriguez |
| 2001 | J.D. Smart (May 17 – Jun 30), Kelly Dransfeldt (st, Sep 25 onward) |
| 2000 | Kelly Dransfeldt (st, May 4 onward) |
| 1999 | Kelly Dransfeldt (until May 19) |
| 1998 | Jonathan Johnson (st), Todd Stottlemyre (Aug 4 – Sep 21) |
| 1997 | Ken Hill (until Jul 24) |
| 1996 | Ken Hill |
| 1995 | Danny Darwin |
| 1994 | Kevin Kennedy (manager) |
| 1993 | Kevin Kennedy (manager) |
| 1992 | Barry Manuel (st) |
| 1991 | Joe Bitker (until Jun 19), Barry Manuel (Sep 6 onward) |
| 1990 | Drew Hall (st), John Hoover (May 23 – 25), Joe Bitker (Sep 6 onward) |
| 1989 | Drew Hall |
| 1988 | Otto Gonzalez (st) |
| 1987 | Tom Paciorek |
| 1986 | Rick Surhoff (st), Tom Paciorek (May 31 onward) |
| 1985 | Cliff Johnson (until Aug 28), Rick Surhoff (Sep 14 onward) |
| 1984 | Danny Darwin |
| 1983 | Danny Darwin |
| 1982 | Danny Darwin |
| 1981 | Danny Darwin |
| 1980 | Danny Darwin |
| 1979 | Danny Darwin |
| 1978 | Danny Darwin |
| 1977 | Frank Lucchesi (manager, until Jun 21) |
| 1976 | Frank Lucchesi (manager) |
| 1975 | Frank Lucchesi (3b coach, manager from Jul 21 onward) |
| 1974 | Sid Hudson (st coach) |
| 1973 | |
| 1972 | Wayne Terwilliger (3B coach) |
Washington Senators Years |
|
| 1971 | Wayne Terwilliger (3B coach) |
| 1970 | Wayne Terwilliger (3B coach) |
| 1969 | Doug Camilli (bullpen coach) |
| 1968 | |
| 1967 | Joe Pignatano (coach) |
| 1966 | Joe Pignatano (coach) |
| 1965 | Joe Pignatano (coach) |
| 1964 | Jim Lemon (coach, st), Hobie Landrith (coach) |
| 1963 | |
| 1962 | |
| 1961 | |
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