| 2024 | Jacob DeGrom (st) |
| 2023 | Jacob DeGrom (until Apr 28) |
| 2022 | Brandon Workman (st) |
| 2021 | |
| 2020 | Rafael Montero (st, Aug 7 onward) |
| 2019 | Rafael Montero (st, Jul 23 onward) |
| 2018 | Paulo Espino (st), Drew Hutchison (Aug 5 – 31) |
| 2017 | |
| 2016 | Colby Lewis |
| 2015 | Colby Lewis |
| 2014 | Colby Lewis (st, Apr 14 – Sep 25) |
| 2013 | Colby Lewis (st) |
| 2012 | Colby Lewis (until Jul 18) |
| 2011 | Colby Lewis |
| 2010 | Colby Lewis |
| 2009 | Thomas Diamond (st) |
| 2008 | John Rheinecker (st), Jim Colborn (bullpen coach, Aug 2 onward) |
| 2007 | John Rheinecker (st, Jun 5 onward) |
| 2006 | Nick Regilio (st), John Rheinecker (Apr 22, May 29 onward) |
| 2005 | Justin Thompson (st), Matt Riley (Apr 7 – May 4), Kevin Gryboski (Jul 22 – Aug 14) |
| 2004 | Colby Lewis (until Apr 17) |
| 2003 | Colby Lewis |
| 2002 | Ismael Valdes (st), Colby Lewis (Apr 1 onward) |
| 2001 | Larry Hardy (pitching coach) |
| 2000 | Larry Hardy (pitching coach) |
| 1999 | Larry Hardy (bullpen coach) |
| 1998 | Terry Clark (st) |
| 1997 | Jose Alberro (st, May 10 – Aug 5) |
| 1996 | Jose Alberro (st, Jul 24, Sep 16 – 28) |
| 1995 | Jose Alberro (st, Apr 27 – Sep 20) |
| 1994 | Claude Osteen (pitching coach) |
| 1993 | Claude Osteen (pitching coach) |
| 1992 | Gerald Alexander (st, May 24 – Jun 30) |
| 1991 | Gerald Alexander (st, Apr 23 onward) |
| 1990 | Robb Nen (st), Gerald Alexander (Sep 9 – 29) |
| 1989 | Scott May (st) |
| 1988 | Scott May (st, Sep 2 – 16) |
| 1987 | Scott Anderson (until Apr 29) |
| 1986 | Bobby Witt |
| 1985 | Dave Stewart (until Sep 12, also wore 43?) |
| 1984 | Mike Rubel (st) |
| 1983 | Mike Smithson |
| 1982 | Nick Capra (st), Mike Smithson (Aug 27 onward) |
| 1981 | |
| 1980 | Frank Lucchesi (coach) |
| 1979 | Frank Lucchesi (coach) |
| 1978 | Bobby Thompson (no, not that one) |
| 1977 | Bobby Thompson (st), Mike Bacsik Sr. (Apr 24 – May 1) |
| 1976 | Bill Singer (until Jun 1) |
| 1975 | Dave Criscione (st) |
| 1974 | Dave Criscione (st) |
| 1973 | Rick Henninger (st) |
| 1972 | |
Washington Senators Years |
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| 1971 | |
| 1970 | |
| 1969 | |
| 1968 | |
| 1967 | |
| 1966 | |
| 1965 | |
| 1964 | |
| 1963 | |
| 1962 | |
| 1961 | |
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