MSR

MSR may refer to:

Science and technology

 * Macrophage scavenger receptor, a receptor found in macrophages
 * Magnetic stripe reader, a device used to read magnetic stripe cards such as credit cards
 * M–sigma relation, in astrophysics
 * Mars sample return mission, a spaceflight mission to return rock and dust samples collected on Mars
 * Mirror self-recognition, in animals through the mirror test
 * Molten salt reactor, an advanced nuclear reactor design

Computing

 * Machine state register, a register used in PowerPC architectures
 * Model-specific register, a feature in x86 processors
 * Microsoft Reserved Partition, a space-management partition on a computer storage device
 * Mining software repositories, a field that analyzes the rich data available in software repositories

Entertainment

 * MSR Studios, a New York recording studio
 * The Most Serene Republic, a Canadian indie rock band
 * Metropolis Street Racer, a Dreamcast racing game
 * Mid-season replacement, a television series that premieres in the second half of a traditional season
 * Metroid: Samus Returns, a video game
 * Mulder Scully Romance, the relationship of the main characters of the television series The X-Files
 * March, Strathspey and Reel, common bagpipe tune set

Organizations and companies

 * Market Street Railway (nonprofit), a historic preservation organization in San Francisco, California, U.S.
 * Microsoft Research, the research division of Microsoft
 * Mountain Safety Research, a US company specializing in outdoor equipment
 * Mouvement social révolutionnaire, the French fascist party Revolutionary Social Movement
 * Movimiento Social Republicano, the Republican Social Movement political party in Spain
 * MSR - The Israel Center for Medical Simulation, Israeli institute for Simulation-Based Medical Education

Places

 * Most Serene Republic, a title in the name of various countries
 * Montserrat (ISO 3166-1 code)

Transportation

 * EgyptAir (ICAO designator), an Egyptian airline
 * Main supply route, a military operations supply route
 * Market Street Railway (transit operator), a defunct company in California, U.S.
 * Maserati, a luxury sports car company
 * Michigan Shore Railroad, US
 * Muar State Railway, a defunct railway formerly operating in the Johor Sultanate, British Malaya
 * Mumbai Suburban Railway, India
 * Muş Airport (IATA airport code), Turkey

Weapons

 * Modern sporting rifle or AR-15 style rifle
 * Modular Sniper Rifle, a sniper rifle produced by Remington Arms
 * Magnum Sniper Rifle or Accuracy International Arctic Warfare, a bolt-action sniper rifle

Other uses

 * Market Stability Reserve, a part of the European Union Emission Trading Scheme
 * Milan–San Remo, an annual bicycle race
 * Mortgage servicing rights, the rights to collect mortgage payments from a borrower for the benefit of the lender
 * Meyer Shank Racing, an American auto racing team