S54

S54 may refer to:

Aircraft

 * Blériot-SPAD S.54, a French biplane trainer
 * Sikorsky S-54, an American helicopter
 * Sukhoi S-54, a proposed Russian trainer aircraft

Other uses

 * S54 (Long Island bus)
 * S54 (New York City bus), serving Staten Island
 * BMW S54, an automobile engine
 * Prince Skyline (S54), a Japanese sedan
 * Ronga language, a Bantu language
 * Shorland S54, a British armoured car
 * Walbunja language, an Australian Aboriginal language
 * Toyota S54, a Toyota S transmission model