| 2025 | Jonah Heim |
| 2024 | Jonah Heim |
| 2023 | Jonah Heim |
| 2022 | Jonah Heim |
| 2021 | Jonah Heim (Apr 4 onward) |
| 2020 | Corey Kluber (st, Jul 26 only) |
| 2019 | Jett Bandy (st) |
| 2018 | Jeff Banister (Manager, until Sep 21) |
| 2017 | Jeff Banister (Manager) |
| 2016 | Jeff Banister (Manager) |
| 2015 | Jeff Banister (Manager) |
| 2014 | Joakim Soria (until Jul 22), Mike Carp (Aug 4 – 28) |
| 2013 | Joakim Soria (st, Jul 7 onward) |
| 2012 | Conor Jackson (st), Robbie Ross (Aug 1 onward) |
| 2011 | Darren Oliver |
| 2010 | Darren Oliver |
| 2009 | Jason Jennings (until Aug 26) |
| 2008 | Kevin Mench (st) |
| 2007 | Matt Kata (until Jun 3), David Murphy (Aug 10 onward) |
| 2006 | Kevin Mench (until Jul 26) |
| 2005 | Kevin Mench |
| 2004 | Kevin Mench |
| 2003 | Kevin Mench (until Jul 8) |
| 2002 | Kevin Mench (st, Apr 9 onward) |
| 2001 | Darren Oliver |
| 2000 | Esteban Loaiza (until Jul 16), Ruben Sierra (Sep 5 onward) |
| 1999 | Esteban Loaiza |
| 1998 | Darren Oliver (until Jul 29), Esteban Loaiza (Jul 18 onward) |
| 1997 | Darren Oliver |
| 1996 | Darren Oliver (st, Apr 15 onward) |
| 1995 | Darren Oliver (until Jun 26) |
| 1994 | Darren Oliver |
| 1993 | Todd Burns (until Jul 17), Darren Oliver (Sep 1 & Oct 2) |
| 1992 | Todd Burns (st, Apr 22 onward) |
| 1991 | Brad Arnsberg (st, Apr 10 – Aug 1) |
| 1990 | Brad Arnsberg (st, May 26 onward) |
| 1989 | Brad Arnsberg |
| 1988 | Mitch Williams |
| 1987 | Mitch Williams |
| 1986 | Mitch Williams |
| 1985 | Frank Tanana (st, Apr 12 – Jun 18), Bob Sebra (Jun 26 – Sep 25) |
| 1984 | Frank Tanana |
| 1983 | Frank Tanana (st, Apr 21 onward) |
| 1982 | Jack Lazorko (st), Frank Tanana (Apr 12 – Sep 20) |
| 1981 | Dennis Lewallyn (st) |
| 1980 | Sparky Lyle (until Sep 9), Dennis Lewallyn (Sep 17 – 24) |
| 1979 | Steve Comer (st), Sparky Lyle |
| 1978 | Steve Comer |
| 1977 | Bert Blyleven |
| 1976 | Art DeFilippis (st), Bert Blyleven (Jun 5 onward) |
| 1975 | Jackie Brown (Apr 10 – Jun 12), Tommy Moore (Jul 8? – Sep 7) |
| 1974 | Bill Gogolewski (st), Jackie Brown (May 1 onward) |
| 1973 | Steve Foucault |
| 1972 | Horacio Pina (st, Apr 16 onward) |
Washington Senators Years |
|
| 1971 | Horacio Pina |
| 1970 | Horacio Pina |
| 1969 | Dennis Higgins |
| 1968 | Buster Narum (st), Dennis Higgins (Apr 11 onward) |
| 1967 | Jim French (st), Buster Narum (Sep 20 – 26) |
| 1966 | Steve Ridzik (st), Jim French (May 3 – Aug 23) |
| 1965 | Steve Ridzik |
| 1964 | Steve Ridzik |
| 1963 | Steve Hamilton (until Apr 19), Jim Coates (Apr 23 – Jun 28), Steve Ridzik (Jul 6 – Sep 25) |
| 1962 | Joe Schaffernoth (st), Steve Hamilton (May 6 – Sep 25) |
| 1961 | Chet Boak (until May 4) |
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