BBO may stand for:
- Barium boron oxide, another name of barium borate
- Big Bang Observer, planned space gravitational wave observatory
- IATA code for Berbera Airport
- "BBO (Bad Bitches Only)", a song by Migos featuring 21 Savage, from the album Culture II
- Beta barium borate (β-BaB2O4) crystal
- Black Bag Operations
- Bundesbahn Österreich, a former name for the Austrian Federal Railways
- Bureau Bijzondere Opdrachten, a Dutch secret service during World War II
- The Bridge Base Inc. web site Bridge Base Online
- British Ballet Organization, a dance teaching and examination board
- Broome Bird Observatory
- BBO, the ICAO code for Flybaboo
- Bottom Bottle Opener, a cap-shaped indentation found in the bottom of Miller High Life bottles in the late 1980s which could be used to open other bottles of Miller High Life.
- Best Bid Offer, a type of financial quote that includes the best bid and ask (offer) prices
disambiguation page lists articles associated with the title BBO.
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