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OSJ may refer to:

  • Optical Society of Japan, a professional organization of physicists
  • Officer of the Order of the Star of Jordan, a military decoration of Jordan
  • Officer of the Venerable Order of Saint John, an order of chivalry
  • San José Observatory, an astronomy observatory in Buenos Aires, Argentina
  • Orchestra of St John's, a UK orchestra
  • Oblates of St. Joseph, a Catholic religious institute