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
This disambiguation page lists articles associated with the title OEF.
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