BBY is a three letter acronym, and may stand for:
- Burnaby, British Columbia, Canada, is the city immediately east of Vancouver.
- "Before the Battle of Yavin", a system of measuring dates in Star Wars.
- Best Buy, where BBY is the ticker symbol of Best Buy Co., Inc. on the New York Stock Exchange
- Back Bay (MBTA station), an Amtrak station located at 145 Dartmouth St., Boston, MA.
- BBY Ltd, an Australian stockbroking and corporate advisory firm.