UCAR may refer to:

• University Corporation for Atmospheric Research, a U.S. organization of atmospheric research institutions
• Unmanned Combat Armed Rotorcraft, a DARPA pilotless attack helicopter, currently under development
• Ujar Rayon, a region in Azerbaijan
• Ucar, Azerbaijan, capital of that region
• Úcar, a municipality in the province of Navarre, Spain
• U-Car, a type of race car built from stock parts
• UCAR Carbon Company, a manufacturer of carbon dust, electrodes, and crucibles

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