R33 may refer to:
- INS Vikramaditya (R33), an active aircraft carrier of the Indian navy.
- R33, a British Airship
- R33 road (South Africa)
- R33 (New York City Subway car)
- R33 Skyline, an automobile by Nissan
- R33, the FAA identifier for Wakonda Beach State Airport in Waldport, Oregon
- R33: Danger of cumulative effects, a risk phrase
- Urinary retention ICD-10 code
R-33 may refer to :
- Vympel R-33 (missile), a Russian air-to-air missile
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