K21 is a South Korean infantry fighting vehicle.
K21 may also refer to:
Vehicles
- Automobiles
- Changhe Freedom K21, a Chinese pickup truck
- Ships
- HMS Dart (K21), a frigate of the Royal Navy
- HSwMS Göteborg (K21), a corvette of the Swedish Navy
- Soviet submarine K-21
- Aircraft
- Schleicher ASK 21, a two-seater training glider commonly referred to as the K21
Other uses
- Gastroesophageal reflux
- Lactobacillus plantarum strain K21
- Uniform k21 polytope
- "Va, dal furor portata", an aria by Wolfgang Amadeus Mozart
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