Horrid Henry: The Movie is a 2011 British 3D comedy film directed by Nick Moore and produced by Allan Niblo, Rupert Preston, Mike Watts, and Lucinda Whiteley, who wrote it. In the film, Henry and the Purple Hand Gang fight to prevent the closure of their school by an evil private school headmaster. It is based on the fictional character Horrid Henry from the children's book series of the same name by Francesca Simon. The film itself takes place before series 3 of the TV series.

Horrid Henry: The Movie stars Theo Stevenson, Richard E. Grant, Parminder Nagra, Kimberley Walsh, Mathew Horne, Siobhan Hayes, Dick and Dom, Noel Fielding, Jo Brand, and Anjelica Huston. It was the first British film for children to be shot in 3D, and was officially released in cinemas on 29 July 2011 in 2D, RealD 3D, and 3D formats by Vertigo Films in the United Kingdom.

Phase 4 Films and Entertainment One released the film in theatres in the United States and Canada on 22 December 2012. The film received generally negative reviews from critics and audiences, who criticised its humour, use of 3D, acting, and low quality, but was positively received from fans of the books and the TV series. It grossed $10.1 million worldwide. Horrid Henry: The Movie was released on DVD and Blu-ray on 28 November 2011 in the United Kingdom. Horrid Henry: The Movie has sold over 750,000 DVD copies in the UK.