| Career - Homeruns Allowed | |||
| Rk | Player Name | Totals | |
| 1 | David Wells | 176 | |
| 2 | Mark Portugal | 124 | |
| 3 | Mark Gardner | 92 | |
| 4 | Stephen Strasburg | 89 | |
| 5 | Orlando Hernandez | 86 | |
| 6 | Livan Hernandez | 83 | |
| 7 | Josh Beckett | 82 | |
| 8 | Chris Young | 81 | |
| 9 | Jack Morris | 80 | |
| 10 | Randy Johnson | 79 | |
| 11 | Javier Vazquez | 77 | |
| 12 | Pat Hentgen | 73 | |
| 13 | Chien-Ming Wang | 66 | |
| 14 | Felix Hernandez | 65 | |
| 15 | Francisco Cordova | 58 | |
| 16 | Shawn Boskie | 55 | |
| 17 | Tim Hudson | 55 | |
| 18 | Matt Harvey | 55 | |
| 19 | Brad Keller | 54 | |
| 20 | Jeff Weaver | 53 | |
| 21 | Paul Maholm | 50 | |
| 22 | Mike Foltynewicz | 50 | |
| 23 | Greg Maddux | 48 | |
| 24 | Joe Magrane | 47 | |
| 25 | John Smiley | 45 | |
| Single Season - Homeruns Allowed | |||||
| Rk | Player Name | Totals | Year | ||
| 1 | Randy Johnson | 56 | 1991 | ||
| 2 | Jack Morris | 46 | 1991 | ||
| 3 | Pat Hentgen | 39 | 1994 | ||
| 4 | Javier Vazquez | 38 | 2001 | ||
| 5 | Mark Gardner | 38 | 1999 | ||
| 6 | David Wells | 35 | 1999 | ||
| 7 | Chris Young | 35 | 2007 | ||
| 8 | Josh Beckett | 35 | 2012 | ||
| 9 | Mike Foltynewicz | 35 | 2020 | ||
| 10 | Shawn Boskie | 34 | 1997 | ||
| 11 | Sterling Hitchcock | 34 | 2000 | ||
| 12 | Pat Hentgen | 33 | 1995 | ||
| 13 | Mike Mussina | 33 | 2004 | ||
| 14 | Brad Penny | 33 | 2002 | ||
| 15 | Jason Simontacchi | 33 | 2003 | ||
| 16 | Jeff Weaver | 33 | 2001 | ||
| 17 | Jordan Yamamoto | 33 | 2020 | ||
| 18 | Javier Vazquez | 32 | 2002 | ||
| 19 | David Wells | 32 | 2005 | ||
| 20 | Livan Hernandez | 31 | 2004 | ||
| 21 | John Cerutti | 30 | 1990 | ||
| 22 | Orlando Hernandez | 30 | 2000 | ||
| 23 | David Wells | 30 | 1997 | ||
| 24 | Mark Gardner | 29 | 1997 | ||
| 25 | Joe Magrane | 29 | 1990 | ||