Britt Allcroft (14 December 1943) is an English film, television and live theater producer, writer, director and voice actress. She is the creator of the children's television series Thomas the Tank Engine & Friends (later re-titled Thomas & Friends), Shining Time Station (with Rick Siggelkow) and Magic Adventures of Mumfie. She wrote, co-produced and directed the film Thomas and the Magic Railroad (2000).

She was born Hilary Mary Allcroft in Worthing, England. At the age of 16, she changed her first name to Britt as her career in British radio and television gained momentum. She went on to create a succession of programmes for the BBC and ITV during the 1970s and 1980s, including Moon Clue Game, Dance Crazy and Keepsakes. Mothers By Daughters, produced for Channel Four, was broadcast by PBS in the United States. She also worked in theatre, staging shows at the London Palladium and Drury Lane Theatres.

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