SP3

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

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