C31

C31 or C-31 may refer to:

Vehicles

• Fokker C-31A Troopship, a Dutch military transport
• Template:HMS, a C-class submarine of the Royal Navy
• Nissan Laurel C31, a Japanese sedan
• Sauber C31, a Swiss Formula One car

Other uses

• Blackstripe corydoras, a tropical freshwater fish
• C-31 highway (Spain), in Catalonia
• C31 road (Namibia)
• Bill C-31, various legislation of the Parliament of Canada
• Caldwell 31, an emission/reflection nebula
• Channel 31 (disambiguation)
• King's Gambit, Falkbeer Countergambit, a chess opening
• C31, a London Cycleway