Sean Gregory May (born April 4, 1984) is an American former professional basketball player and current assistant coach at the University of North Carolina, Chapel Hill. He was born in Chicago, Illinois and grew up in Bloomington, Indiana. He was a three-time all-state selection at Bloomington High School North, and was at one time a teammate of former NBA player Jared Jeffries. May was named to the 2002 McDonald's High School All-American team. He played in the 2002 McDonald's game with Raymond Felton and Rashad McCants, who would later team with May to win an NCAA Championship as part of the 2004–05 North Carolina Tar Heels.

When the heavily-recruited May chose to attend the University of North Carolina at Chapel Hill, it was a major surprise to most basketball recruiting observers; it had been thought that he would stay in his hometown and play for the Indiana University Hoosiers. He had strong family connections to IU; his father Scott was a forward on the school's undefeated 1975–76 NCAA championship team and won the Naismith Award the same year, and his brother Scott Jr. played for the Indiana basketball team that made the NCAA title game in 2002.