Ian

 appears several times in the Doctor Who universe and the real world. They are listed below in alphabetical order by surname. If no surname is available, alphabetization occurs by the disambiguation term — that is, the bit between the parentheses in a title like Waitress (Random Shoes).

As first name

 * Ian Beale (DW: Dimensions in Time)
 * Ian Campbell (EDA: Legacy of the Daleks)
 * Ian Chesterton (DW: An Unearthly Child, et al)
 * Ian Dury (DW: Tooth and Claw)
 * Ian Jenner (DW: Planet of the Dead)
 * Ian Gilmore (DW: Remembrance of the Daleks)
 * Ian Stratford(EDA: The Banquo Legacy)
 * Ian Warne (DW: The Space Pirates)

Sililar

 * Iam (MA: State of Change)

Non-canonical

 * Ian (Dalek movies)

Regular

 * Ian Marter, who played companion Harry Sullivan in Doctor Who.

Guest

 * Ian Boldsworth, who played Banto in DW: Blink.
 * Ian Fairbairn, who had several roles in Doctor Who serials.
 * Ian McNeice, who played Winston Churchill in DW: The Beast Below, Victory of the Daleks, The Pandorica Opens and The Wedding of River Song. He also voiced Zeus in BFA: Immortal Beloved.

Featured

 * Ian Barritt, who played Professor Peach in DW: The Unicorn and the Wasp.
 * Ian Cunningham, who played Dr. Meredith in DW: Doctor Who and the Silurians.
 * Ian Gelder, who played Dekker in TW: Children of Earth.
 * Ian Hanmore, who played Father Angelo in DW: Tooth and Claw.
 * Ian Hogg, who played Josiah Samuel Smith in DW: Ghost Light.
 * Ian Hughes, who played Ralph Finch in TW: The Gathering.
 * Ian McCulloch, who played Nilson in DW: Warriors of the Deep.
 * Ian Porter, who played Foreman in DW: Daleks in Manhattan and DW: Evolution of the Daleks.
 * Ian Saynor, who played Merak in DW: The Armageddon Factor.
 * Ian Sears, who played Brendan Richards in KAC: A Girl's Best Friend.
 * Ian Talbot, who played Travis in DW: Doctor Who and the Silurians and Klout in DW: The Leisure Hive.

Monster specialists

 * Ian Collier, who played Stuart Hyde in DW: The Time Monster and Omega in DW: Arc of Infinity.
 * Ian Midlane, who played Tim Jeffery and Kist Magg Thek Lutiven-Day Slitheen in SJA: Revenge of the Slitheen.
 * Ian Reddington, who played the Chief Clown in DW: The Greatest Show in the Galaxy and voiced Nobody No-One in BFA: A Death in the Family.
 * Ian Thompson, who played DW: Hetra in The Web Planet and Malsan in DW: The Chase.

Extra

 * Ian Cullen, who played Ixta in DW: The Aztecs
 * Ian Frost, who played Baccu in DW: The Ark and a Draconian Messenger in DW: Frontier in Space.
 * Ian Hilditch, who played Geoffrey Baxter in DW: The Christmas Invasion.
 * Ian Hines, who played a Soldier in DW: The Mind Robber.
 * Ian Kay, who played a Snooker Player in TW: Ghost Machine.
 * Ian Liston, who played Hero in DW: The Armageddon Factor.
 * Ian Mackenzie, who played Anderson in DW: Dragonfire.
 * Ian Staples, who played a Soldier in DW: The Caves of Androzani.

Vocal

 * Ian Brooker, a voice actor for Big Finish Productions.
 * Ian Collier, who reprised the role of Omega in Big Finish Productions' Omega.
 * Ian Collins, a radio presenter who played the uncredited role of a Haemovore in DW: The Curse of Fenric.
 * Ian Hallard, a voice actor for Big Finish Productions.
 * Ian Marr, who voiced Ike in the 2001 BFA: Sword of Orion.

Cameramen

 * Ian Adrian, a camera operator for DW: The Vampires of Venice, The Hungry Earth/Cold Blood and Vincent and the Doctor.
 * Ian Punter, the film cameraman on DW: Resurrection of the Daleks.

Designers

 * Ian Bunting, a design assistant during series 2 and 3 of the BBC Wales version of Doctor Who.
 * Ian Watson, a designer for DW: The Space Pirates and DW: Terror of the Autons.

Directors

 * Ian Smith, a director and producer of short form video content for the Torchwood, Sarah Jane Adventures and Doctor Who websites.

Producers

 * Ian Strachan, an Assistant Floor Manager for DW: The Chase and Production Assistant for DW: The Wheel in Space.

Sound design, effects, music

 * Ian Grant, a Sound Recordist for K9.
 * Ian Richardson, a sound recordist for Doctor Who.

Visual effects

 * Ian Scoones, a visual effects designer for several Doctor Who stories.

Writers

 * Ian Stuart Black, a writer for Doctor who in the 1960s.
 * Ian Briggs, who wrote DW: Dragonfire and DW: The Curse of Fenric and their novelisations.
 * Ian McFadyen, who wrote K9TV: The Bounty Hunter.

Other

 * Ian Levine
 * Ian McKendrick, a Film Editor for several Doctor Who stories.
 * Ian Tootle, an Assistant Floor Manager for DW: Mawdryn Undead and DW: Enlightenment.

Prose

 * Ian Atkins, one of the BBC executives.
 * Ian Atkins, the writer of Scientific Adviser in the 1999 anthology More Short Trips.
 * Ian Gregory, who wrote The Best Holiday Ever for Iris: Abroad.
 * Ian Mond, an Australian author of several Bernice Summerfield and Doctor Who short stories for Big Finish Productions.
 * Ian Potter, a writer of Still Lives and several other novels.

Comics

 * Ian Edginton, a comic writer for Doctor Who.
 * Ian Rimmer, who wrote Doctor Conkerer.

Audio

 * Ian Farrington, a director, editor and writer who has done work with Big Finish.