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Oia or OIA may refer to:

In places:

  • Oia, Spain, a municipality in Galicia, in the province of Pontevedra
  • Oia, Greece, a small town on the island of Santorini

In transportation:

  • Ouril├óndia do Norte Airport, an airport with IATA identifier OIA
  • Orlando International Airport ("OIA" is a local abbreviation), which actually uses the letters MCO for its airport designation

In government:

  • Office of the Independent Adjudicator, the higher-education ombudsman in the United Kingdom
  • Official Information Act 1982, a piece of New Zealand legislation
  • DHS Office of Intelligence and Analysis, an office of the United States Department of Homeland Security
  • Office of Intelligence and Analysis (Treasury Department), the intelligence organization of the U.S. Department of the Treasury

In other uses:

  • Oahu Interscholastic Association, an athletic association of public secondary schools on the island of Oahu, Hawaii
  • Oia (genus), a genus of spiders in the Linyphiidae family