John Nicholl may refer to:
John Nicholl (mariner) (fl. 1605–1637?), English mariner and author John Nicholl (judge) (1759–1838), Welsh MP for Penryn and judge John Nicholl (antiquary) (1790-1871), English antiquary John Iltyd Nicholl (1797–1853), Welsh MP for Cardiff and judge
See also John Nichol (disambiguation) John Nicholls (disambiguation)