Listed below are the Major League Baseball players who have hit 30 or more home runs before the All-Star Game break. There were no MLB All-Star games prior to 1933, as the All-Star game is not played exactly at mid-season but about 90 games in (the full season is 162 games).

The list
This list is sorted chronologically. Multiple occurrences are denoted in parentheses.
* The 1994 season was shortened due to MLB players strike.