SP3 may refer to: * sp3 hybrids, a type of orbital hybridisation * Sp3 transcription factor, a protein and the gene which encodes it * Savoia-Pomilio SP.3, a reconnaissance and bomber aircraft built in Italy * USS Zipalong (SP-3), an armed motorboat * 1971 SP3 or 3922 Heather, a main-belt asteroid discovered on September 26, 1971 * 1984 SP3 or 3155 Lee, a main-belt asteroid discovered on September 28, 1984 * SP3, a model of steam toy made by British manufacturer Mamod * Service pack 3, for computer software * Socket SP3, a CPU socket for AMD processors * SP3, a sink in the Sima Pumacocha, a cave in Peru * Surface Pro 3, a 2-in-1 personal computer by Microsoft This disambiguation page lists articles associated with the same title formed as a letter-number combination. If an inte