USAR or U.S.A.R. may refer to:United Speed Alliance Racing, a car racing series in the United States United States Army Rangers, the elite light infantry of the United States Army United States Army Reserve, the reserve component forces of the United States Army University School of Automation & Robotics, Guru Gobind Singh Indraprastha University, Delhi, India Urban search and rescue, rescue operations inside structures or other confined spaces USA Rugby, the governing body of rugby union in the United States