Leslie Percival Lock (3 June 1929 – 21 January 2003) was a New Zealand racing cyclist. Born in Christchurch on 3 June 1929, Lock became involved in cycling through his job as a newspaper delivery boy. He joined the Avon Cycling Club and won his first national title, the junior five-mile road race, in 1946. He went on to win the New Zealand senior 10-mile road race title four times—in 1948, 1949, 1950 and 1957—and the 4000 m individual pursuit title three consecutive times from 1949 to 1951. In all, he won 14 national championship titles.