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)