''Who Do You Think You Are?'' is a series on Creator/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, having featured over 130 celebrities.

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:


[[folder:Series One (2004)]]
* Bill Oddie
* Amanda Redman
* Sue Johnston
* [[Series/TopGear Jeremy Clarkson]]
* [[Series/HaveIGotNewsForYou Ian Hislop]]
* Moira Stuart
* David Baddiel
* Lesley Garrett
* [[Radio/GoodnessGraciousMe Meera Syal]]
* Vic Reeves

[[folder:Series Two (2006)]]
* [[Series/{{Newsnight}} Jeremy Paxman]]
* Sheila Hancock
* Creator/StephenFry
* Julian Clary
* Jane Horrocks
* Gurinder Chadha (director of ''Film/BendItLikeBeckham'')

[[folder:Series Three (2006)]]
* [[Series/EastEnders Barbara Windsor]]
* [[Series/MyFamily Robert Lindsay]]
* Colin Jackson
* Creator/DavidTennant
* David Dickinson
* Creator/NigellaLawson
* Creator/JeremyIrons
* Julia Sawalha

[[folder: Adoption Special (2007)]]
* Nicky Campbell

[[folder:Series Four (2007)]]
* [[NewsBroadcast Natasha Kaplinsky]]
* Creator/JohnHurt
* Griff Rhys Jones
* [[Series/{{Countdown}} Carol Vorderman]]
* Alistair [=McGowan=]
* Graham Norton
* Sir Matthew Pinsent

[[folder:Series Five (2008)]]
* Patsy Kensit
* UsefulNotes/BorisJohnson
* [[Series/TheJerrySpringerShow Jerry Springer]]
* Esther Rantzen
* Ainsley Harriott
* Creator/DavidSuchet
* Jodie Kidd
* Laurence Llewelyn-Bowen

[[folder:Series Six (2009)]]
* Rory Bremner
* [[NewsBroadcast Fiona Bruce]]
* Rick Stein
* [[Series/MyFamily Zoë Wanamaker]]
* Kevin Whately
* [[Series/BigBrother Davina McCall]]
* Chris Moyles
* Kate Humble
* Creator/{{David Mitchell|Actor}}
* [[Series/SexAndTheCity Kim Cattrall]]
* Creator/MartinFreeman

[[folder:Series Seven (2010)]]
* Creator/BruceForsyth
* Rupert Everett
* Dervla Kirwan
* Monty Don
* Rupert Penry-Jones
* Alexander Armstrong
* Jason Donovan
* Hugh Quarshie
* Creator/AlanCumming

[[folder:Series Eight (2011)]]
* Creator/JKRowling
* [[Series/EastEnders June Brown]]
* Alan Carr
* Sebastian Coe
* Larry Lamb
* Creator/EmiliaFox
* Richard Madeley
* [[Series/StrictlyComeDancing Len Goodman]]
* Tracey Emin
* [[Music/TheBeeGees Robin Gibb]]

[[folder:Series Nine (2012)]]
* [[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]]
* Creator/PatrickStewart
* John Bishop
* John Barnes

[[folder:Series Ten (2013)]]
* Una Stubbs
* Nigel Havers
* MinnieDriver
* Lesley Sharp
* Gary Lineker
* [[Series/DragonsDen Nick Hewer]]
* Nitin Ganatra
* Sarah Millican
* Marianne Faithful
* John Simpson

[[folder:Series Eleven (2014)]]
* Creator/JulieWalters
* Creator/BrianBlessed
* Tamzin Outhwaite
* [[Series/{{MrsBrownsBoys}} Brendan O'Carroll]]
* Sheridan Smith
* [[Series/{{TheGreatBritishBakeOff}} Mary Berry]]
* Creator/MartinShaw
* Reggie Yates
* Creator/BillyConnolly
* Twiggy

[[folder:Series Twelve (2015)]]
* [[Series/{{TheGreatBritishBakeOff}} Paul Hollywood]]
* [[Series/{{DrQuinnMedicineWoman}} Jane Seymour]]
* Creator/DerekJacobi
* Jerry Hall
* Gareth Malone
* Anne Reid
* Frank Gardner
* Anita Rani
* Creator/MarkGatiss
* [[Film/HarryPotter Frances de]] [[Theatre/TheHistoryBoys la Tour]]

[[folder:Series Thirteen (2016-17)]]
* Danny Dyer
* Amanda Holden
* Liz Bonnin
* Music/{{Cheryl}}
* [[Series/TheRoyleFamily Ricky Tomlinson]]
* Creator/IanMckellen
* Greg Davies
* Creator/WarwickDavis
* [[Series/{{Casualty}} Sunetra Sarker]]
* [[Series/CrimewatchUK Sophie Raworth]]

[[folder:Series Fourteen (2017)]]
* Creator/CharlesDance
* [[Series/StrictlyComeDancing Craig Revel Horwood]]
* Clare Balding
* [[Series/CitizenKhan Adil Ray]]
* Emma Willis
* Lulu
* Fearne Cotton
* Noel Clarke
* Lisa Hammond

[[folder:Series Fifteen (2018)]]
* Michelle Keegan
* Creator/OliviaColman
* [[Music/CultureClub Boy George]]
* [[Series/JudgeRinder Robert Rinder]]
* Marvin Humes
* [[Series/StrictlyComeDancing Shirley Ballas]]
* Creator/LeeMack
* Jonnie Peacock
Adaptations of the show have been made in 17 other countries, including the USA, Australia, Ireland, Canada, South Africa, Germany and Russia. The US version, produced by [[Series/{{Friends}} Lisa Kudrow]], has itself aired 10 seasons, and has featured over 70 celebrities. Episodes of the UK series featuring Kim Cattrall, Minnie Driver and J.K. Rowling were edited and re-broadcast as part of the American version.

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

!!Contains examples of:

* BlueBlood: A surprisingly high number of celebrities turn out to have this somewhere in their background - however, given the philoprogenitive qualities of Edward and his offspring today it's more a matter of who ''isn't'' descended from him!
** Chat show host Ryan Tubridy turned out to be descended from [[UsefulNotes/TheHouseOfPlantagenet Edward III of England]].
** 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.)
** Comedian Alexander Armstrong manages to trace his family line back to [[UsefulNotes/TheHouseOfNormandy William the Conqueror]]. As does Frank Gardner.
* BoringButPractical: When Creator/LisaKudrow finds out an old relative of hers may be alive, she asks the researcher if they could look through a current record like a voter registry to see if he is still alive. The researcher immediately produces a telephone directory.
* DeliberateValuesDissonance: Most people on the show tend to be highly sympathetic to their ancestors, who may or may not have been particularly sympathetic. The standout so far may be Anne Reid, who wished "horrible deaths" on the people who sentenced her ancestor to seven years of transportation... in spite of the fact that said ancestor was a notorious drunk and domestic abuser who had neglected his duties as a schoolteacher in favour of running a shady construction business and attempted to defraud his father-in-law by forging his signature.
* {{Documentary}}
* 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 [[Series/TheJerrySpringerShow Jerry Springer]] - ''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.