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OAA may refer to:

  • Oceania Athletic Association
  • Office of the Administrative Assistant to the Secretary of the Army
  • Ohio Auctioneers Association
  • Ohio Achievement Assessment
  • The Older Americans Act of 1965
  • Oman Automobile Association, a member of the FIA
  • Ontario Association of Architects
  • Open Adoption Agreement
  • Open Agent Architecture
  • Open Automotive Alliance, an organization to computerize cars
  • Optically active additive, for use in paints and coatings
  • Optometrists Association Australia
  • Oriental Astronomical Association
  • Orlando Apopka Airport
  • Oxaloacetic acid
  • Oxford Aviation Academy
  • Oxley Aviation, Australia ( ICAO operator designator)
  • Ozark Adventist Academy