BDO

BDO may refer to:


 * BDO Global, the world's fifth-largest accountancy network
 * Banco de Oro, one of the largest banks in the Philippines
 * Barton, Durstine & Osborn, the former name of advertising agency BBDO
 * Behavior Detection Officer, part of the Transportation Security Administration
 * Big Day Out, an annual music festival held in Australia and New Zealand
 * Big Dumb Object, a term used in science fiction
 * Black Desert Online, an MMORPG
 * Block Development Officer, the official in charge of an administrative division (block) of some South Asian countries
 * British Darts Organisation (now defunct), former governing body of British darts
 * Business Depot Ogden, the former Defense Depot Ogden Utah converted into a business park
 * Butanediol, especially 1,4-Butanediol, an organic chemical compound
 * Husein Sastranegara International Airport, the IATA code served in Bandung, Indonesia
 * League of German Officers (Bund Deutscher Offiziere), an association of German prisoners of war in the Soviet Union

Computers

 * , an HTML element for bi-directional override, see