LRR

LRR may refer to:
 * Laminated root rot, a root disease in conifers
 * Leucine-rich repeat, a type of protein domain
 * LoadingReadyRun, a Canadian comedy troupe
 * Long Range Radar
 * Long River Review, a literary magazine of the University of Connecticut
 * Low rolling resistance tires, a type of tires designed for fuel efficiency
 * Light Reaction Regiment, the Philippine Army counter-terrorist unit modeled after the U.S. Army Delta Force and British SAS
 * Loose Round Robin, Warp Scheduling