John is a given name that can refer to:
- John, traditional author of one of the books of the Bible
- John Dawlish, an Auror
- John Homme, a wizarding painter
- John Kent, a Muggle greengrocer
- John Stevenson, a man buried in Godric's Hollow
Behind the scenes
Real-world individuals with the given name John include:
Actors
- John Atterbury, the actor who portrayed Phineas Nigellus Black in the film adaptation of Harry Potter and the Order of the Phoenix
- John Cleese, the actor who portrayed Nearly Headless Nick in the first two Harry Potter films
- John Dingain, a British actor who was an extra on the set of Harry Potter and the Deathly Hallows: Part 1
- John Hurt, the actor who portrayed Ollivander in the Harry Potter films
- John Snowden, an English actor who portrayed a wizard in the film adaptations of Harry Potter and the Deathly Hallows
Others
- John King, a supervising art director for the first two Harry Potter films
- John Noe, the Creative Director of The Leaky Cauldron website
- John Richardson, special effects supervisor for the Harry Potter films
- John Seale, an Australian cinematographer who worked on the film adaptation of Harry Potter and the Philosopher's Stone
- John Williams, an American composer who composed the soundtracks for the first three Harry Potter films