OCF

OCF might be an acronym or abbreviation for:

Officer Christian Fellowship, a religous group for military officers
The Oregon Country Fair, an annual event drawing over 40000 people a day
Old Composite Font
Open Computing Facility, UC Berkeley
One Component Frothed PU-Foam, also known as canister PU foam. A foam from an aerosol canister, often used in the construction industry to fill joints and gaps.
Open Cluster Framework, clustering standards (computing)
Orthodox Christian Fellowship, Orthodox campus ministry effort under Standing Conference of Canonical Orthodox Bishops in America