John Nicholson may refer to:
- Actor Jack Nicholson (b. 1937) (Born as John Nicholson)
- John Nicholson (racing driver) (b. 1941)
- John Nicholson (naval officer) (1756–1844), Continental Navy officer during the American Revolution
- John Nicholson (general) (1822–1857) The "Hero of Delhi"
- John Nicholson (New South Wales politician)
- John Nicholson (Western Australian politician)
- John Nicholson (biblical scholar)
- John Nicholson (engine driver). Contributed to the invention of the compound steam locomotive
- John Nicholson (New York) (1765–1820), a United States Representative from New York
- John A. Nicholson (1827–1906), a United States Representative from Delaware
- John Henry Nicholson (1838–1923), an Australian writer
- John Gambril Nicholson (1866–1931), an English writer
- John Robert Nicholson (1901–1983), a former Lieutenant-Governor of British Columbia
- John Sanctuary Nicholson (1863–1924), British politician and soldier
- John Nicholson (footballer), footballer
- John Nicholson (football writer, broadcaster and novelist)


