John Nicholls
John or Jack Nicholls may refer to:
- John Nicholls (controversialist), Welsh religious controversialist
- John Nicholls (MP), British Member of Parliament for Bletchingley 1783-87 and for Tregony 1796-1802
- John C. Nicholls, United States Representative from Georgia
- Jack Nicholls (footballer), Welsh international footballer
- John Walter Nicholls, British ambassador
- Jack "Putty Nose" Nicholls, Australian waterfront identity
- John Nicholls (RAF officer), British air marshal
- John Graham Nicholls, British/American/Swiss physiologist/neuroscientist
- Johnny Nicholls, English footballer
- John Nicholls (footballer), Australian footballer
- John Nicholls (surgeon), British surgeon
- Jack Nicholls, British Anglican Bishop of Sheffield
- John Nicholls, British Committee of 100 signatory