BFO is an abbreviation that stands for: Basic Formal Ontology Beat frequency oscillator used to create an audio frequency signal for receiving continuous wave (Morse code) transmissions The Black Forest Observatory in Germany BiFeO3 (Bismuth ferrite), an inorganic chemical compound Boron monofluoride monoxide Budapest Festival Orchestra Bunker Fuel Oil, a (low-cost) type of fuel oil Federal Consultative Assembly (Bijeenkomst voor Federaal Overleg), an organisation of federal states of the United States of Indonesia