BB3 may refer to:
- BB3, a postcode district the BB postcode area
- Bombesin-like receptor 3, also known as BB3
- Big Brother 3 (disambiguation), a television programme in various versions
- BB3 (film), a 2021 Indian Telugu-language film directed by Boyapati Srinu, starring Balakrishna; the title being from their names Balakrishna-Boyapati (BB)
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