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