| 2025 | Alejandro Osuna (May 25 onward) |
| 2024 | Jose Barrero (st) |
| 2023 | |
| 2022 | Dennis Santana |
| 2021 | Anderson Tejeda (Apr 9 – 16) |
| 2020 | |
| 2019 | Shelby Miller (until Jun 25) |
| 2018 | Jurickson Profar |
| 2017 | Jurickson Profar (until Jul 7) |
| 2016 | Jurickson Profar (st, May 27 onward) |
| 2015 | Ed Lucas (st) |
| 2014 | Tommy Hanson (st), Seth Rosin (Mar 31 – Apr 7), Hector Noesi (Apr 14 – 20), Dan Robertson (Apr 29 onward) |
| 2013 | Aaron Cunningham (st) |
| 2012 | Koji Uehara |
| 2011 | Chris Davis (until Jul 30), Koji Uehara (Jul 31 onward) |
| 2010 | Chris Davis |
| 2009 | Chris Davis |
| 2008 | Edgardo Alfonzo (st), Chris Davis (June 26 onward) |
| 2007 | Jason Botts (st, Aug 1 onward) |
| 2006 | Brian Anderson (st) |
| 2005 | Jason Conti (st) |
| 2004 | Jason Conti (st, Jun 15 – Jul 18), Scott Erickson (Aug 7 – 22) |
| 2003 | Juan Gonzalez (until Jul 19) |
| 2002 | Juan Gonzalez (until Jul 30) |
| 2001 | Gabe Kapler |
| 2000 | |
| 1999 | Juan Gonzalez |
| 1998 | Juan Gonzalez |
| 1997 | Juan Gonzalez (st, May 2 onward) |
| 1996 | Juan Gonzalez |
| 1995 | Juan Gonzalez |
| 1994 | Juan Gonzalez |
| 1993 | Juan Gonzalez |
| 1992 | Juan Gonzalez |
| 1991 | Juan Gonzalez (st, Apr 26 onward) |
| 1990 | Juan Gonzalez (st, Aug 31 onward) |
| 1989 | Bob Meacham (st), Jeff Stone (Apr 15 – May 28), Juan Gonzalez (Sep 1 onward) |
| 1988 | Curtis Wilkerson |
| 1987 | Curtis Wilkerson |
| 1986 | Curtis Wilkerson |
| 1985 | Curtis Wilkerson |
| 1984 | Curtis Wilkerson |
| 1983 | Curtis Wilkerson (st, Sep 10 onward) |
| 1982 | Tommy Helms (coach) |
| 1981 | Jim Norris (st) |
| 1980 | Jim Norris |
| 1979 | Bert Campaneris (until May 1) |
| 1978 | Bert Campaneris |
| 1977 | Darold Knowles (st), Bert Campaneris (Apr 7 onward) |
| 1976 | Leo Cardenas (st), Fritz Peterson (May 30 – Jun 19) |
| 1975 | Leo Cardenas |
| 1974 | Fergie Jenkins (st), Leo Cardenas (Apr 28 – Sep 14) |
| 1973 | Mike Thomson (st), Sonny Siebert (May 13 – Sep 26) |
| 1972 | Gerry Janeski (st) |
Washington Senators Years |
|
| 1971 | Denny Riddleberger |
| 1970 | Dennis Dalton (st), Joe Grzenda (until Sep 12), Cisco Carlos (Sep 15 – 27) |
| 1969 | Dennis Dalton (st) |
| 1968 | Dick Such (st), Gerry Schoen (Sep 14 only) |
| 1967 | Jim Hannan (until May 24) |
| 1966 | Jim Hannan (st, May 1 onward) |
| 1965 | Jim Hannan (until Apr 22, Sep 11 – 29) |
| 1964 | Bob Baird (st), Jim Hannan |
| 1963 | Jim Hannan |
| 1962 | Jim Hannan |
| 1961 | Mike Garcia (Jul 21 – Sep 2) |
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