AR2 may refer to:
- AR2 (train), European railbus
- Arkhangelsky Ar-2, Soviet dive bomber
- Arkansas's 2nd congressional district
- Arkansas Highway 2
- Dorand AR2, a French two-seater aircraft of World War I, also converted to a two-casualty ambulance version
- Ar2, the chemical formula for diargon
See also
- SAR (IPCC), the IPCC Second Assessment Report (aka AR2)
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