Sa4

Sa4 or SA-4 may refer to:


 * Sa4 (Luwian hieroglyph), the 4th of 7 hieroglyphs for Sa in Hieroglyphic Luwian
 * Sa4 (rapper), German rapper, member of band 187 Strassenbande
 * Saturn I SA-4, an Apollo program launch
 * 2K11 Krug, a Russian surface-to-air missile system