BDO may refer to:

  • Ballon d'Or, an annual football award
  • Banco de Oro, one of the largest banks in the Philippines
  • Barton, Durstine & Osborn, the former name of advertising agency BBDO
  • BDO Global, the world's fifth-largest accountancy network
  • BDO USA
  • 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 and psychoactive drug
  • League of German Officers (), an association of German prisoners of war in the Soviet Union
  • The IATA code of Husein Sastranegara International Airport, the airport serving Bandung, Indonesia

Computers

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