50 Home Runs in a season has been 50 times, including the American League and National League leaders in 2024. In 9 of those 50 seasons, the batter hit one Inside Park Home Run (IPHR) and no batter did it more than once. None hit a bouncing HR, which was possible through 1930. Back then, if it bounced over the fence, it was a Home Run. Babe Ruth supposedly never hit a bouncing Home Run.
OPHR: Outside Park Home Run
Sorted by HR descending, Year ascending HR bold means led league:
Note: In 1997 McGwire led MLB but neither league; traded from AL to NL. That's the only 50 HR season in which a player was traded during the season.
| theYear | Player | HR | IPHR | Bounced | OPHR | Pct Over | L |
| 2001 | Barry Bonds * (SFG) | 73 | 0 | | 73 | 100% | NL |
| 1998 | Mark McGwire (STL) | 70 | 0 | | 70 | 100% | NL |
| 1998 | Sammy Sosa (CHC) | 66 | 0 | | 66 | 100% | NL |
| 1999 | Mark McGwire (STL) | 65 | 0 | | 65 | 100% | NL |
| 2001 | Sammy Sosa (CHC) | 64 | 1 | | 63 | 98.44% | NL |
| 1999 | Sammy Sosa (CHC) | 63 | 0 | | 63 | 100% | NL |
| 2022 | Aaron Judge (NYY) | 62 | 0 | | 62 | 100% | AL |
| 1961 | Roger Maris * (NYY) | 61 | 0 | | 61 | 100% | AL |
| 1927 | Babe Ruth+ * (NYY) | 60 | 1 | 0 | 59 | 98.33% | AL |
| 1921 | Babe Ruth+ * (NYY) | 59 | 0 | 0 | 59 | 100% | AL |
| 2017 | Giancarlo Stanton (MIA) | 59 | 0 | | 59 | 100% | NL |
| 1932 | Jimmie Foxx+ (PHA) | 58 | 1 | | 57 | 98.28% | AL |
| 1938 | Hank Greenberg+ (DET) | 58 | 1 | | 57 | 98.28% | AL |
| 1997 | Mark McGwire (OAK-STL) | 58 | 0 | | 58 | 100% | AN |
| 2006 | Ryan Howard * (PHI) | 58 | 0 | | 58 | 100% | NL |
| 2024 | Aaron Judge (NYY) | 58 | 0 | | 58 | 100% | AL |
| 2001 | Luis Gonzalez | 57 | 0 | | 57 | 100% | NL |
| 2002 | Alex Rodriguez (TEX) | 57 | 0 | | 57 | 100% | AL |
| 1930 | Hack Wilson+ (CHC) | 56 | 1 | 0 | 55 | 98.21% | NL |
| 1997 | Ken Griffey * (SEA) | 56 | 0 | | 56 | 100% | AL |
| 1998 | Ken Griffey * (SEA) | 56 | 0 | | 56 | 100% | AL |
| 1920 | Babe Ruth+ * (NYY) | 54 | 0 | 0 | 54 | 100% | AL |
| 1928 | Babe Ruth+ * (NYY) | 54 | 0 | 0 | 54 | 100% | AL |
| 1949 | Ralph Kiner+ (PIT) | 54 | 0 | | 54 | 100% | NL |
| 1961 | Mickey Mantle+ # (NYY) | 54 | 1 | | 53 | 98.15% | AL |
| 2006 | David Ortiz * (BOS) | 54 | 0 | | 54 | 100% | AL |
| 2007 | Alex Rodriguez (NYY) | 54 | 0 | | 54 | 100% | AL |
| 2010 | Jose Bautista (TOR) | 54 | 1 | | 53 | 98.15% | AL |
| 2023 | Matt Olson *(ATL) | 54 | 0 | | 54 | 100% | NL |
| 2024 | Shohei Ohtani *(LAD) | 54 | 0 | | 54 | 100% | NL |
| 2013 | Chris Davis *(BAL) | 53 | 0 | | 53 | 100% | AL |
| 2019 | Pete Alonso (NYM) | 53 | 0 | | 53 | 100% | NL |
| 1956 | Mickey Mantle+ # (NYY) | 52 | 0 | | 52 | 100% | AL |
| 1965 | Willie Mays+ (SFG) | 52 | 0 | | 52 | 100% | NL |
| 1977 | George Foster (CIN) | 52 | 0 | | 52 | 100% | NL |
| 1996 | Mark McGwire (OAK) | 52 | 0 | | 52 | 100% | AL |
| 2001 | Alex Rodriguez (TEX) | 52 | 0 | | 52 | 100% | AL |
| 2002 | Jim Thome (CLE) | 52 | 0 | | 52 | 100% | AL |
| 2017 | Aaron Judge (NYY) | 52 | 0 | | 52 | 100% | AL |
| 1947 | Johnny Mize+ * (NYG) | 51 | 0 | | 51 | 100% | NL |
| 1947 | Ralph Kiner+ (PIT) | 51 | 0 | | 51 | 100% | NL |
| 1955 | Willie Mays+ (NYG) | 51 | 1 | | 50 | 98.04% | NL |
| 1990 | Cecil Fielder (DET) | 51 | 0 | | 51 | 100% | AL |
| 2005 | Andruw Jones (ATL) | 51 | 0 | | 51 | 100% | NL |
| 1938 | Jimmie Foxx+ (BOS) | 50 | 0 | | 50 | 100% | AL |
| 1995 | Albert Belle (CLE) | 50 | 0 | | 50 | 100% | AL |
| 1996 | Brady Anderson (BAL) | 50 | 0 | | 50 | 100% | AL |
| 1998 | Greg Vaughn (SDP) | 50 | 0 | | 50 | 100% | NL |
| 2000 | Sammy Sosa (CHC) | 50 | 0 | | 50 | 100% | NL |
| 2007 | Prince Fielder * (MIL) | 50 | 1 | | 49 | 98.00% | NL |
| | | | | | | |
| total IPHR | | 9 | | | |
Most Home Runs per season over fences. Friday, June 24, 2011
Mickey Mantle: 1958 Home Run leader because of three Inside Park Home Runs (IPHR) in 27 days. Saturday, March 22, 2025
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