Basil Oliver Allen (13 October 1911 – 1 May 1981) was an English first-class cricketer.
Allen was educated at Clifton College and Caius College, Cambridge. A left-handed batsman and fine close fieldsman, he played for Cambridge University Cricket Club in 1932 and 1933. He then enjoyed a long county career as an amateur for Gloucestershire from 1932 to 1951, captaining the county in 1937 and 1938 and from 1947 to 1950. He also played first-class matches for Marylebone Cricket Club from 1936 to 1939 and the Gentlemen in 1938.
Allen scored 14 first-class hundreds, with his only double century, 220, coming against Hampshire in 1947. His best season was 1938, when he scored 1785 runs at an average of 34.32.
