MSR explained

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

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

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
, 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

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

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

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

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