Julian Illingworth (born January 30, 1984) is an American professional squash player.
Illingworth first made an impression on the American junior circuit in 1998-1999 when he finished third in the country for boys under 16.
Illingworth attended Yale University when his age was 18. He was a 4 time All-American selection and 4 time All-Ivy selection. He also won 2 US National Titles during his junior and senior years at Yale.