OSF
The abbreviation OSF may refer to:
- Sergeant Major, military rank
- Onafhankelijke Senaatsfractie, a faction in the Dutch First Chamber
- Open Software Foundation
- Franciscans ( Ordo Sancti Francisci )
- Ordre de Saint Fortunat, International Association Charitable et Culurelle
- Old Style Figures, a term used in typography
- Disambiguation
- Abbreviation