| 2023 | Dane Dunning |
| 2022 | Dane Dunning |
| 2021 | Dane Dunning |
| 2020 | Brian Flynn (st1), Yadiel Rivera (Aug 23 – Sep 1) |
| 2019 | Drew Smyly (until Jun 19) |
| 2018 | Martin Perez |
| 2017 | Martin Perez |
| 2016 | Martin Perez |
| 2015 | Martin Perez (st, Jul 17 onward) |
| 2014 | Martin Perez (until May 10) |
| 2013 | Martin Perez (st, May 27 onward) |
| 2012 | Martin Perez (st, Jun 27 onward) |
| 2011 | Brandon Webb (st) |
| 2010 | Cliff Lee (Jul 9 onward) |
| 2009 | Kevin Milwood |
| 2008 | Kevin Milwood |
| 2007 | Kevin Milwood |
| 2006 | Kevin Milwood |
| 2005 | Thomas Diamond (st) |
| 2004 | Brian Jordan |
| 2003 | Ben Kozlowski (st) |
| 2002 | Bill Haselman |
| 2001 | Bill Haselman |
| 2000 | Bill Haselman |
| 1999 | John Burkett |
| 1998 | John Burkett |
| 1997 | John Burkett |
| 1996 | Dan Smith (st), John Burkett (Aug 8 onwards) |
| 1995 | Roger Luce (st) |
| 1994 | Jose Canseco |
| 1993 | Jose Canseco (until Jun 23) |
| 1992 | Donald Harris (st), Jose Canseco (Sep 4 onward) |
| 1991 | Bill Haselman (st), Donald Harris (Sep 4 onward) |
| 1990 | Bill Haselman (st, Sep 3 onward) |
| 1989 | Bill Haselman (st) |
| 1988 | Bob Brower |
| 1987 | Bob Brower |
| 1986 | Glen Cook (st) |
| 1985 | Glen Cook (st, Jun 23 onward) |
| 1984 | Glen Cook (st) |
| 1983 | Jim Farr (st) |
| 1982 | Doc Medich (until Aug 9), Jim Farr (Sep 7 onward, also wore 35 unknown dates) |
| 1981 | Doc Medich |
| 1980 | Doc Medich, Don Kainer (st, Sep 6 onward, also wore 43, not sure which dates) |
| 1979 | Doyle Alexander |
| 1978 | Doyle Alexander |
| 1977 | Doyle Alexander |
| 1976 | Craig Skok (st, Aug 12 – Sep 26) |
| 1975 | David Harper (st), Jim Gideon (Sep 14 only) |
| 1974 | Lenny Randle |
| 1973 | Jim Kremmel, Don Durham, Chuck Estrada (pitching coach) |
| 1972 | Frank Howard |
Washington Senators Years |
|
| 1971 | Frank Howard |
| 1970 | Frank Howard |
| 1969 | Frank Howard |
| 1968 | |
| 1967 | Jim Duckworth (st) |
| 1966 | Joe McCabe (st) |
| 1965 | Joe McCabe (Apr 15 – May 22) |
| 1964 | Don Rudolph |
| 1963 | Don Rudolph |
| 1962 | Don Rudolph |
| 1961 | |
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