SS4

SS4 may refer to:
 * SS-4 Sandal, a Soviet theatre ballistic missile
 * Ambrosini SS.4, an Italian fighter aircraft prototype
 * Pindad SS4, an Indonesian battle rifle in development
 * SS 4, an Italian state highway, linking Rome to the Adriatic sea
 * Super Select, a four-wheel drive system produced by Mitsubishi
 * USS Grampus (SS-4), a submarine of the United States Navy
 * Super Saiyan 4, a fictional transformation from the Dragon Ball series