C30 may refer to:
Vehicles Aircraft Caspar C 30, a German reconnaissance aircraft Cierva C.30, a Spanish autogyro Curtiss C-30 Condor, an American military transport aircraft Siren C.30 Edelweiss, a French sailplane
Automobiles Great Wall Voleex C30, a Chinese subcompact Nissan Laurel C30, a Japanese sedan Sauber C30, a Swiss Formula One car Volvo C30, a Swedish hatchback
Rail transport New South Wales C30 class locomotive, an Australian steam locomotive SL C30, a subway train of the Stockholm metro
Ships , a Thomaston-class landing ship of the Brazilian Navy , a C-class submarine of the Royal Navy , a Fiji-class light cruiser of the Royal Navy
Other uses C30 road (Namibia) AMD C-30, a mobile processor Caldwell 30, a spiral galaxy King's Gambit, a chess opening Protecting Children from Internet Predators Act, an Act of the Parliament of Canada introduced as Bill C-30 C30, a compact audio cassette C30 endopeptidase, also called 3C-like protease