Dominican-born Chicago Cubs slugger Sammy Sosa hit a record 20 home runs in June 1998, a Guinness World Record for the most home runs by any player in a single calendar month.
Record no. MRB-2026-006370
Most home runs in a month (MLB)
Reference Record – Not Certified
This record is compiled from publicly available sources for reference. It has not been examined or certified by The Book of World Records.