John Nicholls

John or Jack Nicholls may refer to:
 * John Nicholls (controversialist) (1555–1584?), Welsh religious controversialist
 * John Nicholls (MP) (c. 1745–1832), British Member of Parliament (MP) for Bletchingley 1783–87 and for Tregony 1796–1802
 * John C. Nicholls (1834–1893), United States Representative from Georgia
 * Jack Nicholls (footballer) (1898–1970), Welsh international footballer
 * John Walter Nicholls (1909–1970), British ambassador
 * Jack "Putty Nose" Nicholls (1912–1981), Australian waterfront identity
 * John Nicholls (RAF officer) (1926–2007), British air marshal
 * John Graham Nicholls (1929–2023), British/American/Swiss physiologist/neuroscientist
 * Johnny Nicholls (1931–1995), English footballer
 * John Nicholls (footballer) (born 1939), Australian footballer
 * John Nicholls (surgeon), British surgeon
 * Jack Nicholls (born 1943), British Anglican Bishop of Sheffield
 * John Nicholls, British Committee of 100 signatory