John (or Jon or Jahn) could refer to:
- People
- Jahn, a resident of Miri's homeworld
- John (missionary), a missionary with the Acolytes of the Stars
- John (security), a security officer aboard Space Station Sigma One
- John Allen, a security officer aboard the USS Enterprise-E
- John Ambrose, the doctor who first identified Sherman's Plague
- John André, a British major during the American Revolutionary War
- John Augustine Swaddock, CO of the Niagara-class USS Sacajawea
- John Bearclaw, CO of the USS Gallant
- John Bowler, an officer aboard the USS Equinox
- John Broome, a CPO on Deep Space 9
- John Burke, chief astronomer for the British Royal Academy, first to chart Sherman's Planet
- John Candlewood, chief science officer of Deep Space 9 (II)
- John Christopher, a 20th century United States Air Force pilot
- John Coffren (reporter), a 24th century reporter for UFP Today
- John Donne, a 17th century English poet
- John Eaves (Admiral), a member of the Starfleet Admiralty Board
- John Elijah, XO of the USS Huron
- John of England, the King of England from 1199 to 1216
- John Ericssen, a 20th century Augment
- John Farrell, former USS Enterprise navigator, an instructor at Starfleet Academy
- John Ford, a 20th century Earth movie director
- John Fredrickson, a casualty of the Dominion War
- John Gellman, acting CO of the USS Demeter
- John Gill, a Federation historian and instructor at Starfleet Academy
- John Gill (mirror), his Mirror Universe counterpart
- John Glenn, the first American to orbit Earth, CO of Project Mercury's Friendship 7
- John Hammond, a colonist on Mariposa, one of five original surviving settlers
- John Harriman, CO of the USS Bnterprise-B
- John Harriman (mirror), a lieutenant aboard the ISS Hornet
- John "Blackjack" Harriman, Commander-in-Chief of Starfleet in the late 2280s decade
- John Holliday, an Ancient West gunfighter at the O.K. Corral
- Jon Huss, Dupuy Professor of Military History at Starfleet Academy
- John Jacks, director of 1938's radio production of The Adventures of Captain Proton
- John Kayser, a political science professor at Starfleet Academy
- John Keats, a 19th century Earth poet
- John Kendricks, a colleague of Doctor Leonard McCoy in 2264
- John F. Kennedy, 35th President of the United States
- John Kirk, a United States Army Air Corps pilot during World War II
- John Kyle, former transporter chief of the USS Enterprise, XO of the USS Hood
- John Lee, deputy security chief of the Enterprise (NX-01)
- John Lennon, a popular Earth musician, member of The Beatles rock group
- John Levinson, chairman the Starfleet Sciences department at Starfleet Academy
- John Lewinski, CO of the Defiant-class USS Monitor
- John Lurry, station manager of Deep Space Station K-7 in the 2260s
- John Major, a 20th century Prime Minister of the United Kingdom
- John Masefield, a noted 20th century Earth poet
- John Mayhill, a casualty at the Cochrane Research Facility on Sirius IV
- John Milton, a noted 17th century poet
- John Nee, a cadet aboard the USS Enterprise-C in 2332
- John Paul Jones, a naval fighter during the American Revolutionary War
- John Frederick Paxton, 22nd century leader of the xenophobic Terra Prime group
- John Frederick Paxton (mirror), a genetic engineering researcher
- John Proudstar, a.k.a. Thunderbird, a member of the X-Men in an alternate reality
- John Pym, leader of the Long Parliament in England during the 1640s
- John Ross, a 23rd century Starfleet security chief
- John Russ, an officer aboard the USS Enterprise
- John Ryan, a 23rd century Starfleet helmsman
- John Sheehan, a MACO corporal who served on Deneva
- John Stanley, a casualty of Earth's Vietnam War
- John Stewart, a member of the Green Lantern Corps in an alternate reality
- John Stone, CO of the Miranda-class USS Cortez
- St. John Talbot, an ambassador on Nimbus III
- John Taylor, an efficiency auditor in the Federation Auditor General's office
- John Thomas, a casualty of Earth's Vietnam War
- John Tiklak, a Human aboard Deep Space 9
- John Torres, the father of B'Elanna Torres
- John Van Citters, a science officer aboard the USS Thantos
- John Van Citters Raymond, a relative of Clare Raymond
- John von Neumann, a physicist who worked on Earth's Manhattan Project
- John Watkins, a technician aboard the USS Enterprise
- John Wayne, a popular 20th century Ancient West movie actor
- John Wheeler, the 20th century physicist who popularized the term "black hole"
- Jon, a member of the leadership Council on the planet Perry
- Jon (Tendaran), prime minister of Tendar IV
- Jon Anderson, a Starfleet security officer who was replaced by an Imperial Intelligence agent
- Kell (Jon Anderson), the agent who replaced him
- Jon Chin, a security guard and shuttle pilot aboard the USS Tereshkova
- Jon Cooper, XO of Vanguard Station
- Jon Daily, CO of the Astral Queen transport
- Jon Duncan, a physician with the 23rd century Frontier Medics Program
- Jon Eaglefeather, a division chief of public affairs for Starfleet Intelligence
- Jon Geuder, a Starfleet science officer
- Jon Grinsberg, a relative of Clare Raymond
- Jon Jakob Thorsson, CO of the Hokule'a-class USS Tripoli
- Jon Joffin, a 24th century member of Starfleet Operations
- Jon Lyman, CO of the Earth Starfleet starship Achilles
- Jon Monson, a casualty of the Dominion War
- Jon Pertwee, a relative of Clare Raymond
- Jon Povill, a 23rd century doctor on Oby VI
- Jon Rachman, CO of the USS Regal
- Jon Stephens, an alias of Lady Q during a visit to the USS Enterprise-E
- Characters
- John Rambo, a featured character in a series of Earth movies
- John Watson, an associate of Sherlock Holmes
- Real-world topics
- John Blackford, a Pocket Books cover artist
- John Bridges, a Last Unicorn RPG artist
- John Canning, a TOS UK comic strips artist
- John Coffren, a Strange New Worlds contest winner
- John de Lancie, a TNG author, the actor who portrayed Q
- John S. Drew, an SCE ebook author
- John Eaves, exterior designer of the USS Enterprise-E, Ships of the Line artist
- John M. Ford, a TOS and FASA author
- John Grigni, a Last Unicorn RPG artist
- John Han, a Ships of the Line artist
- John Kalisz, a Marvel Comics colorist
- John Jackson Miller, a TTN, TNG, and DSC novelist
- John J. Ordover, a Pocket Books editor and writer
- John Peel, a TNG and DS9 novelist
- John Rodriguez, a TOS reference book author
- S. John Ross, a Last Unicorn RPG author
- John Snead, a Last Unicorn RPG author
- John Stokes, a TOS UK comic strips artist
- John Takis, a Strange New Worlds contest winner
- John Teska, a Ships of the Line artist
- John Vornholt, a TNG novelist
- John Warner, a Gold Key Comics author
- John Wick, a Last Unicorn RPG author
- See also: Jonathan
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