O21
O21 may refer to:
O21 (film), a 2014 Pakistani action thriller film
Hoopa Airport in Humboldt County, California, United States
O 21-class submarine, of the Royal Netherlands Navy
HNLMS O 21, a submarine of this class
O21 scale, a model railway scale
Otoyol 21, a motorway in Turkey
Oxygen-21, an isotope of oxygen
Thomas-Morse O-21, an observation aircraft of the United States Army Air Corps
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