An English actress, known for her role as Miss Ruth Jones in the television sitcom Rising Damp from 1974 until 1978. She is a Tony Award winner and three-time Olivier Award winner.
She performed as Mrs. Lintott in the play The History Boys in London and on Broadway, winning the 2006 Tony Award for Best Featured Actress in a Play. She reprised the role in the 2006 film. Her other film roles include Madame Olympe Maxime in Harry Potter and the Goblet of Fire (2005) and Harry Potter and the Deathly Hallows – Part 1 (2010). Other television roles include Emma Porlock in the Dennis Potter serial Cold Lazarus (1996), Headmistress Margaret Baron in BBC sitcom Big School and Violet Crosby in the sitcom Vicious.
De la Tour was born in Bovingdon, Hertfordshire, to Moyra (née Fessas) and Charles de la Tour. The name was also spelt De Lautour, and it was in this form that her birth was registered in Hemel Hempstead, Hertfordshire, in the third quarter of 1944. She has French, Greek, and Irish ancestry. She was educated at London’s Lycée Français and the Drama Centre London.