C8

C8 or C-8 may refer to:

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• The Diemaco C8, a rifle.
• The Citroën C8, a brand of minivan made by Citroën.
• C8, a musical note 4 octaves above middle C.
• HMS C8, a C-class submarine of the Royal Navy.
• USS Raleigh (C-8), a protected cruiser of the United States Navy.
• C8, an international standard paper size (57×81 mm), defined in ISO 216.
• Castle Infinity, the first graphical massively multiplayer online game.
• Ammonium perfluorooctanoate or Perfluorooctanoic acid, a chemical used in the production of Teflon®.