RAR or Rar may refer to: Radio acoustic ranging, a non-visual technique for determining a ship's position at sea "rar", the ISO 639-2 code for the Cook Islands Māori language RAR (file format), a proprietary compressed archive file format in computer software Rarotonga International Airport, Cook Islands, IATA code RAR Rarus, or Rar, a figure in Greek mythology Retinoic acid receptor, a type of protein Rhodesian African Rifles, a unit of the Rhodesian Army Rock Against Racism, a UK movement Rock am Ring and Rock im Park, a German rock music festival Royal Australian Regiment, a unit of the Australian Army Ruger American Rifle, a line of centerfire bolt-action rifles Grupo RAR, a Portuguese company WinRAR, RAR, and UNRAR computer software for compressed archive files Ridotto Alpino Repubblicano, Republican Alpine Redoubt (RAR), intended last stronghold of the Italian fascists at the end of World War II Rarh region, region in eastern India