UAR may refer to:

• United Arab Republic, the state formed by the union of the republics of Egypt and Syria in 1958. It existed until Syria's secession in 1961, although Egypt continued to be known as the UAR until 1971.
• Argentine Rugby Union (Spanish: Unión Argentina de Rugby), the official governing body of rugby union in Argentina.
• Union of African Railways, an organization of African railways.
• Aerostar Airlines (ICAO code:UAR), a Ukrainian airline.

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