William Leonard "Len" Chamberlain (15 January 1889 – 21 March 1956) was an Australian first-class cricketer who played Sheffield Shield cricket for South Australia. He was also an Australian rules footballer for Norwood in the South Australian Football League (SAFL).An all-rounder, Chamberlain got his first called up to the South Australian team in the 1907/08 cricket season, when he played against the touring Marylebone Cricket Club in a first-class fixtures.