Ernest Barnes (1874–1953) was a British mathematician, scientist, liberal theologian, and bishop.
Ernest Barnes may also refer to:
- Ernest Barnes (athlete) (1885–1956), British track and field athlete
- Ernest Barnes (field hockey) (born 1937), New Zealand field hockey player
- Ernie Barnes (1938–2009), African-American painter and football player
- Ernest Harlington Barnes (1899–1985), member of the Legislative Council of Bermuda
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