John Nichol
John Nichol may refer to:
- John [Pringle Nichol], Scottish scientist; mentor to William Thomson
- John Nichol (biographer), Scottish biographer
- John Nichol (footballer), English footballer
- John Nichol (RAF officer), RAF navigator shot down and taken prisoner during the first Gulf War
- John [Lang Nichol], Canadian Senator
- John Nichol, fictional character from DC Comics going by the alias of Doctor Polaris