Impulse is a 1974 American horror thriller film, starring William Shatner as a serial killer of wealthy widows. Ruth Roman, Kim Nicholas, Jennifer Bishop and Harold Sakata co-star. It was written by Tony Crechales and directed by William Grefé.

The film was first released in Tampa, Florida, on January 31, 1974, where the filming took place. It was subsequently released nationwide in 1974–75, making nearly $4 million in the domestic box office.