Nightmare
- År: 1964
- Land: United Kingdom
- Genre: Thriller, Gyser, Mysterium
- Studio: Hammer Film Productions
- Nøgleord: dreams, nightmare, father murder, suicide attempt, asylum, girls' boarding school, psychological thriller, girls' school
- Direktør: Freddie Francis
- Cast: David Knight, Moira Redmond, Jennie Linden, Brenda Bruce, George A. Cooper, Irene Richmond