R33

R33 may refer to:


 * R-33 (missile), a Soviet air-to-air missile
 * R33 (South Africa), a road
 * R33 (New York City Subway car)
 * HM Airship R.33, of the Royal Air Force
 * HMS Terpsichore (R33), a destroyer of the Royal Navy
 * INS Vikramaditya (R33), an aircraft carrier of the Indian navy
 * Nissan Skyline (R33), a mid-size car
 * Nissan Skyline GT-R (R33), a sports car
 * R33: Danger of cumulative effects, a risk phrase
 * Renard R.33, a Belgian trainer
 * Urinary retention
 * Wakonda Beach State Airport in Lincoln County, Oregon