C51

C51 or C-51 may refer to:

Legislation

• Anti-terrorism Act, 2015, introduced as Bill C-51 in the 41st Canadian Parliament, 2nd Session
• Bill C-51 of the 39th Canadian Parliament, 2nd Session, a proposed amendment to the Food and Drugs Act

Vehicles

• , an Admirable-class minesweeper of the Mexican Navy
• Caudron C.51, a French biplane floatplane
• Douglas C-51, an American transport aircraft
• JNR Class C51, a Japanese steam locomotive

Other uses

• Caldwell 51, an irregular dwarf galaxy
• Evans Gambit, a chess opening
• GeForce 6100, a graphics processing unit