AR2

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)