C-class submarine may refer to:
- British C-class submarine, the last class of petrol engined submarines of the Royal Navy
- United States C-class submarine, five boats built for the United States Navy
- Japanese Type C 1st class submarine, two classes submarines:
- Type C submarine
- I-52-class submarine (Type C3 submarine)
- Japanese Type C 3rd class submarine, three classes submarines:
- Ha-1-class submarine (Type C1 submarine)
- Ha-3-class submarine (Type C2 submarine)
- Ha-7-class submarine (Type C3 submarine)