C17

C17, C-17 or C.17 may refer to:

Air transport

• Boeing C-17 Globemaster III, a military transport aircraft
• C-17 Super Vega, a six-passenger monoplane
• Cierva C.17, a 1928 English experimental autogyro

Land transport

• C-17 highway (Spain) also known as Eix del Congost, a primary highway in Catalonia
• Queensland C17 class locomotive
• Sauber C17, a 1998 Formula One car

Undersea transport

• HMS C17, A 1917 British C class submarine

Other

• C17, a female two-pole IEC 60320 electrical cable connector that mates with a male C18 appliance inlet
• Caldwell 17 (NGC 147), a dwarf spheroidal galaxy of the Local Group in the constellation Cassiopeia
• a 17-Carbon molecule in chlorophyll metabolism
  • Precorrin-3B C17-methyltransferase, an enzyme involved in that metabolism
• City 17, A fictional location in the Half-Life universe
• The ICD-10 code for Small intestine cancer
• French Defence, Encyclopaedia of Chess Openings code
• The 17th century