BB3 may refer to:

• BB3, a postcode district the BB postcode area
• Bombesin-like receptor 3, also known as BB₃
• Big Brother 3, a television programme in various versions

• O Grande Circo Místico
• O Grande Circo Místico (trilha sonora)
• Ograzhden Cove
• Ograzhden, Dobrich Province
• Ograđenovac
• OGRE1
• Ogre3D
• OGRE 3D
• O G Readmore
• OG Readmore
• Ogre (band)
• Ogre Battle: Limited Edition
• Ogre Battle: March of the Black Queen
• Ogre Claus
• O G R E (comics)
• OGRE (comics)
• O. G. R. E. (comics)
• Ogre Kingdoms
• Ogre Municipality
• Ogren park at allegiance field
• Ogre of Ardennes
• Ogre of the Ardennes
• Ogre (river)
• Ogres Apriņķis
• Ogres District