Peter James Sainsbury (13 June 1934 – 12 July 2014) was an English first-class cricketer who played for Hampshire from 1954 to 1976 and the Marylebone Cricket Club from 1955 to 1960. Born in Chandler's Ford, Hampshire, Sainsbury was a right-handed middle-order batsman and a slow left-arm bowler. He was a regular in Hampshire's team for 22 seasons from 1955 to 1976. That period coincided with the county's most successful time in first-class cricket: Hampshire won the County Championship for the first time in 1961 and did it again in 1973. Sainsbury was the only player who featured in both teams, and he was named as a Wisden Cricketer of the Year in the 1974 edition of the almanack.