His acting career began by a fluke, with "a chance knock at the door looking for kids to work in films." He made his film debut age five in Adam and Evelyn (1946) with Jean Simmons and Stewart Granger, and worked as an extra before training at the Corona Stage Academy. As a youngster he had a cameo playing a schoolboy in Carry On Teacher (1959), and appeared in two films with Sir Norman Wisdom, Trouble in Store (1953) and The Bulldog Breed (1960). He later rejoined the famous Carry On series of films for Carry On Behind (1975), Carry On England (1976) and Carry On Emmannuelle (1978). His other film roles included What a Crazy World (1963), All Neat in Black Stockings (1968), The Body Stealers (1969), Before Winter Comes, (1969), Ghost Story (1974) and The Bunker (1981).
From 1984 to 1992, he played Sergeant Alec Peters in 227 episodes of the ITV police series The Bill. In 2017, Dann shared his memories of working on the series, as well as talking about his life and career in general, for The Bill Podcast. He joined the Theatre Workshop in 1962 and appeared in numerous plays directed by Joan Littlewood including Oh what a Lovely War in London, Paris and New York.
- "Larry Dann". BFI.
- "Carry-On Actors". Books.google.co.uk.
- "Larry Dann". Aveleyman.com.
- "Larry Dann - Filmography - Movies & TV". Nytimes.com.
- "The Bill Podcast 05 - Larry Dann (Sgt. Alec Peters)". Soundcloud.com. Retrieved 26 October 2018.
- Michael Billington. "Oh What a Lovely War: the show that shook Britain". The Guardian.
- Romano Cagnoni/courtesy of Theatre Royal Stratford East Archive Collection. "Oh What a Lovely War: Joan Littlewood's musical returns to Stratford East - in pictures". The Guardian.
- "Onstage Footage of 'the Projector' (1970) - BFI". BFI.