OEF

OEF may refer to:

• Obscene Extreme Festival, an annual music festival in the Czech Republic since 1999
• Operation Enduring Freedom, official U.S. government name for "the Global War on Terrorism" 2001–2014
• Order of Ecumenical Franciscans, a religious sub-order of the Franciscans
• Oxygen Extraction Fraction, a measure of oxygen utilization efficiency

{{dab}}