FMR may refer to:
- Ferromagnetic resonance, a spectroscopic technique used to probe the magnetization of ferromagnetic materials
- Fidelity Management & Research, the investment management arm of Fidelity Investments
- Fine Music Radio, a classical and jazz radio station which broadcasts in Cape Town, South Africa and on the Internet
- FMR Records, a Ebglish record label
- FMR layout (of an automobile), see Front mid-engine, rear-wheel-drive layout
- FMR, an Italian art magazine published by Franco Maria Ricci
- Festival Mushroom Records, a defunct Australian record label
- Les Fusiliers Mont-Royal, a Canadian reserve infantry unit based in Montreal
- False match rate, in biometric matching, the probability that a system incorrectly matches an input pattern to a non-matching template
- Fahrzeug- und Maschinenbau GmbH, Regensburg, manufacturer of the Messerschmitt KR200 and FMR Tg500