Who Do You Think You Are? ist eine britischeDoku-Serie, die sich in jeder Folge mit einem Ausschnitt aus der Familiengeschichte eines anderen Prominenten befasst. Die Politiker, Musiker, Schauspieler, Sportler etc. sammeln Informationen von ihren noch lebenden Verwandten und erhalten anschließend Unterstützung professioneller Genealogen bei der Suche nach älteren Dokumenten. Dabei konzentrieren sie sich meist auf einen einzelnen, für sie persönlich bzw. für das Publikum potenziell besonders interessanten Zweig ihres Stammbaums. Das Format startete 2004 und wird seither im zweiten Programm der öffentlich-rechtlichen Fernsehanstalt BBC (BBC Two) ausgestrahlt.
Seit 2004 wurden 15 Staffeln mit insgesamt Folgen ausgestrahlt.
Oddie, brought up by his father and paternal grandmother, goes back to the Birmingham area to learn more about his mother's life and her struggles with manic depression and her mother-in-law. Then he learns more about his grandmother's life, her husband and family in Rochdale, Lancashire. He ends his journey learning more about his Oddie ancestors in Grindleton, Lancashire.
Hislop, who was 12 when his father died, never met his grandfathers. Hislop traces his family history by travelling to his late mother's native Jersey, where for five years of her childhood, the island was occupied by Nazi Germany. He travels to Clary, France, where his paternal grandfather fought with the 9th Highland Light Infantry against the Hindenburg Line. He then goes to South Africa, where his maternal grandfather fought with the Royal Lancaster Regiment in the Battle of Spion Kop during the Boer War. While in South Africa, he discovered his father's maternal great great grandfather had gone to South Africa in 1795 with the 72nd Regiment, Duke of Albany's Own Highlanders in an expedition to capture Cape Town from the Dutch.