OAA

OAA may refer to:


 * Oakwood Adventist Academy
 * Oceania Athletic Association
 * Office of the Administrative Assistant to the Secretary of the Army
 * Ohio Auctioneers Association
 * Ohio Achievement Assessment
 * Old Achimotans Association
 * 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
 * Opticians Association of America
 * Optometrists Association Australia
 * Oriental Astronomical Association
 * Orlando Apopka Airport
 * Oxaloacetic acid
 * Oxford Aviation Academy
 * Oxley Aviation, Australia (ICAO operator designator)
 * Ozark Adventist Academy