OSF

OSF may stand for:

• Ógra Shinn Féin, the youth wing of the Sinn Féin political party
• Old style figures
• Open Software Foundation
• Operational Support Facility
• Opera Show Format, an XHTML-based slideshow format
• Ordered-Sorted Feature Logic, a logic formalism
• Oregon Shakespeare Festival repertory theatre in Ashland, Oregon
• Oxford Scientific Films
• The Old Spaghetti Factory
• Independent Senate Fraction or Onafhankelijke Senaatsfractie, a political group of the Netherlands
• Order of Servant Franciscans, a Franciscan order

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