John or Jack Turnbull may refer to:

• Jack Turnbull (footballer) (1885–1917), Australian rules footballer
• Jack Turnbull (lacrosse) (1910–1944), American lacrosse player
• Jack Turnbull (rugby union), Australian international rugby union player
• John E. Turnbull, Canadian inventor of the first rolling wringer clothes washer, 1843
• John Turnbull (voyager), English explorer to the Pacific in 1800–1805
• John Turnbull (actor) (1880–1956), British film actor
• John Turnbull (priest) (1905–1979), English Anglican priest
• John Turnbull (cricketer) (born 1935), New Zealand cricketer
• John Turnbull (musician) (born 1950), English pop and rock guitarist and singer
• John W. Turnbull (born 1936), Canadian politician in the Legislative Assembly of New Brunswick

Topics referred to by the same term

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