Factual

Cast List: O

Kirsten O'Brien (cast in 12 episodes, e.g. Self in Totally Doctor Who (#2.12))
Peter O'Brien (cast as Self in Is There Life on Mars?)
Ardal O'Hanlon (cast as Self in Are We There Yet?)
Tracy-Ann Oberman (cast in 3 episodes, e.g. Self in The Women of Doctor Who)
Ingrid Oliver (cast in 2 episodes, e.g. Self in Behind The Lens: The Day of The Doctor)
Travis Oliver (cast as Self in Are We There Yet?)
Jamie Oram (cast as Self in About A Boy)
Tony Osoba (cast as Self in Doctor Who Extra: Kill The Moon)