Aaron Boone's Three-Home-Run Game, 2003

Aaron Boone hit three home runs in one game for the Cincinnati Reds against the St. Louis Cardinals on May 8, 2003. The Cincinnati Reds won 8–6.

The game was played at Great American Ballpark in Cincinnati. The announced attendance was 30,567. The game took 2h 49m. It was a day game under cloudy skies, at 68 degrees.

Aaron Boone did it twice in all. Garrett Stephenson started for the St. Louis Cardinals. Dan Iassogna umpired behind the plate. It is the second of eleven three-home-run games the archive records that season.