USR may refer to:
USRobotics, a technology firm USR (Guadeloupe football club), in Sainte-Rose, Guadeloupe U.S. Robots and Mechanical Men, a fictional robot manufacturer /usr, directory in Unix systems, see Filesystem Hierarchy Standard A variant of the Steyr AUG, assault rifle Save Romania Union, a Romanian political party Union of Serbs of Romania, a Romanian political party USR (BASIC) ("User Serviceable Routine"), a common BASIC instruction to execute native machine code Upward Sun River site, archaeological site in Alaska Uxbridge and South Ruislip, a parliamentary constituency in the United Kingdom Unión Santafesina de Rugby, body that rules the game of rugby union in Santa Fe, Argentina
See also μSR, Muon Spin Rotation or muon spin spectroscopy USSR (disambiguation)