The most home runs Babe Ruth hit in a single season was 60. He did this in 1927.
Barry Bonds hit the most home runs in a single postseaon with 8 in 2002.
The most home runs Hank Aaron hit in an MLB season was 47 in 1971.
The single-season record-holder for most home runs in a year is Barry Bonds. He hit 73 home runs in 2001.
Barry Bond hit 73 home runs in 2001 to set the single season home run record.
Barry Bonds with 73 in one season
Barry Bonds with 73.