OEP may refer to:
Government Office of Emergency Preparedness, United States, 1968–1973 Office of Emergency Planning (Ireland), formed 2001 Office for Environmental Protection, United Kingdom, formed 2021 (National Health Insurance Fund), Hungary, formed 1993
Other businesses and organisations One Equity Partners, the private equity affiliate of JPMorgan Chase Open Energy Platform, a project providing database infrastructure for open energy system models Optometric Extension Program Oxfordshire Economic Partnership
Other uses Octaethylporphyrin, a chemical Open Educational Practices Open enrollment period, during which employees may change health insurer Occurrence Exceedance Probability, a risk curve used in catastrophe modeling