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