Phil Williamson (born May 29, 1965) is a former professional tennis player from the United States who competed for Antigua and Barbuda in the Davis Cup.

Phil Williamson was the number one player for Columbia University before joining the professional circuit in 1987.

[1] At the 1987 US Open, Williamson made it through qualifying and faced Australian John Fitzgerald in the first round.

[3] Also that year, Williamson teamed up with Todd Nelson at the Boston Pro Championships and the pair finished runners-ups.

[3] Williamson played Davis Cup tennis for Antigua and Barbuda from their competition debut in 1996, until 1999.