The Horse's Mouth is a 1958 film directed by Ronald Neame and filmed in Technicolor. Alec Guinness wrote the screenplay, which was based on the 1944 novel The Horse's Mouth by Joyce Cary. Guinness also played the lead role of Gulley Jimson, a London artist.

Ronald Neame CBE, BSC was an English film producer, director, cinematographer, and screenwriter. Beginning his career as a cinematographer, for his work on the British war film One of Our Aircraft Is Missing (1943) he received an Academy Award nomination for Best Special Effects. During a partnership with director David Lean, he produced Brief Encounter (1945), Great Expectations (1946), and Oliver Twist (1948), receiving two Academy Award nominations for writing.