Oliver Dimsdale (born 28 October 1972) is an English actor, known for portraying Louis Trevelyan in the BBC TV serial He Knew He Was Right. Born in Aylesbury, Buckinghamshire, he was brought up in Hertfordshire. Dimsdale is the son of a Swiss mother. He has a sister, Anna. He developed a stammer at age six which he has since partially brought under control through speech therapy. Dimsdale attended the Dragon School and then Eton College, and went on to study French and Economics at university. He trained at Guildhall School of Music and Drama, graduating in 1999.

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