John Turnbull may refer to:
- Jack Turnbull (footballer) (1885–1917), Australian rules footballer
- Jack Turnbull (1910–1944), American lacrosse 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 1953), English pop and rock guitarist and singer
- John W. Turnbull (born 1936), Canadian politician in the Legislative Assembly of New Brunswick
John Charles McNicol Turnbull was an Australian rules footballer who played with South Melbourne in the Victorian Football League. After a short VFL career, he returned to the bush and settled in Ballarat. He enlisted in the army during World War I, and was severely injured while in active service. He died of his wounds in 1917.
John E. Turnbull was a Canadian inventor who lived in Saint John, New Brunswick in the 19th century. He is notable for inventing the first rolling wringer clothes washer in 1843.
John Turnbull was an English seaman who was most noted for his 1800-1805 voyage to the South Pacific on behalf of the East India Company. During this voyage, which was published in 1810, he made observations in Tahiti, Hawaii, and Australia, that have become important texts to the indigenous and settler histories of those places. Included in these observations were his comments on the mahoo or mahu transgenders of Tahiti, which were transphobic, typically of their time, but part of the LGBT history of the Pacific Islands.
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