C21

C-21, C 21, or C21 may refer to:

• C21 Sako TRG M10 Sniper Weapon System, Canadian Armed Forces sniper rifle.
• C21 (group), a Danish boy band
  • C21 (album), 2003
• C-21 Dolphin, a flying boat used by the United States Army Air Corps
• HMS C21, a 1909 British C class submarine
• Learjet C-21, an American military transport aircraft
• Sauber C21, a 2002 racing car
• Space Adventures C-21, a Russian design for a suborbital rocket plane for Space Adventures
• Anal cancer (ICD-10 code: C21)
• Center Game (Encyclopaedia of Chess Openings code: C21)
• Caldwell 21 or NGC 4449, an irregular galaxy in the constellation Canes Venatici
• Carbon-21 (C-21 or ²¹C), an isotope of carbon
• Catch 21, a television game show based on blackjack
• HMS Glasgow (C21)

See also

• 21st century
• Century 21 (disambiguation)
• 21c (disambiguation)