- BI stands for (Run) Batted In (Baseball)
- BI stands for Baccalauréat International (French: International Baccalaureate)
- BI stands for Background Information
- BI stands for Background Investigation
- BI stands for Backplane Interconnect
- BI stands for Backward Indicator
- BI stands for Bacterial Infection
- BI stands for Bad Influence (band)
- BI stands for Bainbridge Island (Washington state)
- BI stands for Banca d’Italia (Italian central bank)