MFO may refer to:

Organisations

  • Maison Française d'Oxford, a French research institute based in Oxford, England
  • Multinational Force and Observers, an international peacekeeping force; or the related medal
  • Maschinenfabrik Oerlikon, a defunct Swiss manufacturing company, merged into Brown, Boveri & Cie in 1967
  • Mathematisches Forschungsinstitut Oberwolfach (Mathematical Research Institute of Oberwolfach), in Germany
  • MrFixitOnline, a prominent gaming site focusing on online games, notably Age of Empires II: The Age of Kings that specialized in expert strategy and high caliber tournaments, in operation from ~2000 - 2006.
  • Multi-family office, organisations which protect and grow the wealth of several families by providing full growth and philanthropic investment advice.

Entertainment

  • MFÖ, a Turkish band
  • My Family Online, a website/forum for hit BBC One sitcom, My Family

Science

  • In immunology, Multi Function Oxidase
  • Mixed-function oxidase

Other

  • MFO, IATA airport code of Manguna Airport in Papua New Guinea
  • Marine Fuel Oil