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''Who Do You Think You Are?'' is a series on TheBBC where (mostly British) celebrities investigate their family trees. Some celebrities find some very interesting relatives -- including royalty. The series debuted in 2004 and is still ongoing.

The definition of "celebrity" is a little loose and often includes any old BBC presenter with a familiar face and a few weeks to spare, but this is not important as it seems almost anyone has a few fascinating stories in their family tree.

Celebrities on the BBC version have been:

[[foldercontrol]]

[[folder:Series One]]
* Bill Oddie
* Amanda Redman
* Sue Johnston
* [[TopGear Jeremy Clarkson]]
* [[HaveIGotNewsForYou Ian Hislop]]
* Moira Stuart
* David Baddiel
* Lesley Garrett
* [[GoodnessGraciousMe Meera Syal]]
* Vic Reeves
[[/folder]]

[[folder:Series Two]]
* [[{{Newsnight}} Jeremy Paxman]]
* Sheila Hancock
* StephenFry
* Julian Clary
* Jane Horrocks
* Gurinder Chadha (director of ''BendItLikeBeckham'')
[[/folder]]

[[folder:Series Three]]
* [[{{Eastenders}} Barbara Windsor]]
* [[{{MyFamily}} Robert Lindsay]]
* Colin Jackson
* Creator/DavidTennant
* David Dickinson
* NigellaLawson
* Creator/JeremyIrons
* Julia Sawalha
[[/folder]]

[[folder: Adoption Special]]
* Nicky Campbell
[[/folder]]

[[folder:Series Four]]
* [[NewsBroadcast Natasha Kaplinsky]]
* Creator/JohnHurt
* Griff Rhys Jones
* [[Series/{{Countdown}} Carol Vorderman]]
* Alistair [=McGowan=]
* Graham Norton
* Sir Matthew Pinsent
[[/folder]]

[[folder:Series Five]]
* Patsy Kensit
* BorisJohnson
* JerrySpringer
* Esther Rantzen
* Ainsley Harriott
* David Suchet
* Jodie Kidd
* Laurence Llewelyn-Bowen
[[/folder]]

[[folder:Series Six]]
* Rory Bremner
* [[NewsBroadcast Fiona Bruce]]
* Rick Stein
* [[{{MyFamily}} ZoŽ Wanamaker]]
* Kevin Whately
* [[BigBrother Davina McCall]]
* Chris Moyles
* Kate Humble
* Creator/DavidMitchell
* [[Series/SexAndTheCity Kim Cattrall]]
* MartinFreeman
[[/folder]]

[[folder:Series Seven]]
* Creator/BruceForsyth
* Rupert Everett
* Dervla Kirwan
* Monty Don
* Rupert Penry-Jones
* Alexander Armstrong
* Jason Donovan
* Hugh Quarshie
* [[Film/{{X-Men}} Alan Cumming]]
[[/folder]]

[[folder:Series Eight]]
* Creator/JKRowling
* [[Series/EastEnders June Brown]]
* Alan Carr
* Sebastian Coe
* Larry Lamb
* [[Series/SilentWitness Emilia Fox]]
* Richard Madeley
* [[StrictlyComeDancing Len Goodman]]
* Tracey Emin
* [[Music/TheBeeGees Robin Gibb]]
[[/folder]]

[[folder:Series Nine]]
* [[Series/EastEnders Samantha Womack]]
* Creator/AlexKingston
* [[Music/{{Eurythmics}} Annie Lennox]]
* Gregg Wallace
* [[Radio/TheNowShow Hugh Dennis]]
* [[Series/CoronationStreet William Roache]]
* [[Series/{{Dinnerladies}} Celia]] [[Series/{{Kingdom}} Imrie]]
* PatrickStewart
* John Bishop
* John Barnes
[[/folder]]

[[folder:Series Ten]]
* Una Stubbs
* Nigel Havers
* MinnieDriver
* Lesley Sharp
* Gary Lineker
* [[Series/DragonsDen Nick Hewer]]
* Nitin Ganatra
* Sarah Millican
* Marianne Faithful
* John Simpson
[[/folder]]

[[folder:Series Eleven (aired so far)]]
* JulieWalters
* BrianBlessed
[[/folder]]
[[hardline]]
Other versions of the show have been made for American, Australian, Irish, Canadian and South African television. The American version, produced by [[Series/{{Friends}} Lisa Kudrow]], featured Sarah Jessica Parker, Matthew Broderick, Brooke Shields, Emmitt Smith, Susan Sarandon, Spike Lee and Kudrow herself.

Has nothing to do with "[[Anime/TengenToppaGurrenLagann Who the hell do you think we are?]]".

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!!Contains examples of:

* BlueBlood: A surprisingly high number of celebrities turn out to have this somewhere in their background. Amongst others chat show host Ryan Tubridy turned out to be descended from [[TheHouseOfPlantagenet Edward III of England]].
** Given the philoprogenitive qualities of Edward and his offspring today it's more a matter of who ''isn't'' descended from him!
** The ultimate example: Sir Matthew Pinsent (knighted for Olympic prowess) turns out to be descended from God. (By extension, so is everyone else who can trace their tree back to Edward the Confessor, but it's Pinsent they show actual proof to.)
** And comedian Alexander Armstrong manages to trace his family line back to [[TheHouseOfNormandy William the Conqueror]].
* {{Documentary}}
* FollowTheLeader / DuelingShows: ITV's ''You Don't Know You're Born''. As [[Series/HarryHillsTVBurp Harry Hill]] put it:
--> '''Harry:''' If you like TheBBC's ''Series/WhoDoYouThinkYouAre'', you may be interested in ITV's ''You Don't Know You're Born'', which is ''the same''.
** Later ITV combined this with a look at Victorian institutions in ''Tales from [[GaolTime the Clink]]'' and ''Tales from the Workhouse''.
* ForeignRemake: In many countries, as noted above.
* ShownTheirWork: Little is dumbed down, and even the maps take historical border changes into account (a common mistake in documentaries).
* SoundtrackDissonance: Yes, BBC, the upbeat sounds of "Young Folks" by Peter, Bjorn and John are an excellent choice for most of your trailers for this series. No, BBC, you should not play it over footage of anyone - even JerrySpringer - ''walking around a former concentration camp, weeping''. The effect is most disquieting.
* {{Tearjerker}}: Almost every celebrity has at least one ancestor who has an incredibly tragic life... and the celebrities frequently end up crying.
** And a significant number of them have relatives who witnessed, fled from, or died in the Holocaust. Once {{lampshaded}} by Chris Moyles, who took a lot of flak for it.

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