| 2025 | Evan Carter (st, May 6 – Aug 21) |
| 2024 | Evan Carter |
| 2023 | John King (st, May 13 – Jul 6), Evan Carter (Sep 8 onward) |
| 2022 | John King |
| 2021 | Justin Anderson (st) |
| 2020 | Yadiel Rivera (st), Derek Dietrich (Aug 11 – Sep 27) |
| 2019 | Jayce Tingler (ML Player development field coordinator) |
| 2018 | Kevin Jepsen (until May 19), Eddie Butler (Jul 27 onward) |
| 2017 | Josh Hamilton (st) |
| 2016 | Josh Hamilton (st) |
| 2015 | Kyle Blanks (st), Josh Hamilton (May 25 onward) |
| 2014 | Chaz Roe (st), Pedro Figueroa (Mar 31 – Apr 22) |
| 2013 | Nate Robertson (st) |
| 2012 | Josh Hamilton |
| 2011 | Josh Hamilton |
| 2010 | Josh Hamilton |
| 2009 | Josh Hamilton |
| 2008 | Josh Hamilton |
| 2007 | Ron Mahay (until Jul 29), Luis Mendoza (Sep 8 onward) |
| 2006 | Ron Mahay (st, Apr 24 onward) |
| 2005 | Ron Mahay (until Aug 3) |
| 2004 | Ron Mahay |
| 2003 | Ron Mahay (st, Jun 26 onward) |
| 2002 | Dan Miceli (until Apr 26), Anthony Telford (May 27 – Jul 15) |
| 2001 | Rick Helling |
| 2000 | Rick Helling |
| 1999 | Rick Helling |
| 1998 | Rick Helling |
| 1997 | Duane Ward (st), Rick Helling (Aug 13 onward) |
| 1996 | Rick Helling (until Jul 19), Mike Stanton (Aug 1 onward) |
| 1995 | Rick Helling (until May 14) |
| 1994 | Terrell Lowery (st), Rick Helling (Apr 10 – May 21) |
| 1993 | Charlie Leibrandt (until Sep 21) |
| 1992 | Hector Fajardo (st) |
| 1991 | Robb Nen (st), Calvin Schiraldi (Jun 21 – Jul 3 (conflict)), Terry Mathews (Jun 21 – Sep 6), Hector Fajardo (Sep 7 onward) |
| 1990 | Thad Bosley (until May 30) |
| 1989 | Ray Hayward (st), Thad Bosley (Jun 27 onward) |
| 1988 | Don Werner (st), Ray Hayward (May 3 – Jul 5) |
| 1987 | Alan Knicely (st) |
| 1986 | Gary Ward (until Sep 3) |
| 1985 | Gary Ward |
| 1984 | Gary Ward |
| 1983 | Jon Matlack (until Sep 15) |
| 1982 | Jon Matlack |
| 1981 | Jon Matlack (until Sep 13) |
| 1980 | Jon Matlack |
| 1979 | Jon Matlack (st, May 1 – Jul 1) |
| 1978 | Jon Matlack |
| 1977 | David Clyde (st), Darold Knowles (Apr 18 onward) |
| 1976 | David Clyde (st) |
| 1975 | David Clyde (st, Sep 17 only) |
| 1974 | David Clyde |
| 1973 | Ken Esposito (st), Rick Stelmaszek (Apr 17 – May 19), David Clyde (Jun 27 onward) |
| 1972 | Paul Lindblad |
Washington Senators Years |
|
| 1971 | Darold Knowles (until May 7), Paul Lindblad (May 15 onward) |
| 1970 | Darold Knowles |
| 1969 | Darold Knowles (st, May 26 onward) |
| 1968 | Darold Knowles (until Jul 12) |
| 1967 | Rich Nold (st), Darold Knowles (Apr 10 onward) |
| 1966 | Paul Casanova (st), Diego Segui (Apr 17 – Jul 22), Frank Kreutzer (Jul 30 – Sep 15) |
| 1965 | Tim Cullen (st), Paul Casanova (Sep 18 – Oct 2) |
| 1964 | Chuck Hinton |
| 1963 | Chuck Hinton |
| 1962 | Chuck Hinton |
| 1961 | Joe Hicks (Apr 15 – May 7), Chuck Hinton (May 14 onward) |
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