S52

S52 may refer to:
 * S52 (New York City bus), serving Staten Island
 * BMW S52, an automobile engine
 * Expressway S52 (Poland)
 * S52: Not recommended for interior use on large surface areas, a safety phrase
 * SIAI S.52, an Italian prototype fighter aircraft
 * Sikorsky S-52, an American helicopter
 * Shorland S52, a British armoured car