BEF may refer to:
Arts and media BEF (image format), used by HDR PhotoStudio Bibliothèque des Ecoles françaises d'Athènes et de Rome, mediaeval history books (1877–1960) British Electric Foundation, a band (1981–2013)
Military Brazilian Expeditionary Force, 1942–1945 British Expeditionary Force (World War I), 1914–1918 British Expeditionary Force (World War II), 1939–1940
Transport Benfleet railway station, Essex, England (BEF) Bluefields Airport, Nicaragua (IATA:BEF)
Other uses Belgian franc, a defunct currency (ISO 4217:BEF) Binary entropy function, in information theory Bonus Expeditionary Force, an American veterans' protest Bovine ephemeral fever British Equestrian Federation, in horse racing Black Eye Friday, British pre-Christmas revelry