John Neumann (1811–1860) was a Bohemian-American bishop.
John Neumann may also refer to:
- St. John Neumann, Bryn Mawr, a Roman Catholic parish in the Archdiocese of Philadelphia
- John von Neumann (1903–1957), Hungarian-American mathematician
- Johnny Neumann (1950–2019), American basketball player and coach
- John Robert Neumann Jr. (1972–2017), perpetrator of the Orlando factory shooting in 2017
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