MRL may refer to:
- Magnetic Reference Laboratory, an American company that makes and sells Calibration Tapes
 - Mineral Resources Limited, Australian mining company
 - Official Monster Raving Loony Party, a UK political party
 - Montana Rail Link, a US railroad
 - Merck Research Laboratories, an American pharmaceutical company
 
Technology related:
- Manufacturing readiness level, a measure of the maturity of the manufacturing readiness of an object of technology related to Technology Readiness Level (TRL)
 - Maximum residue limit, a trading standard, usually for pesticide residues on foodstuffs
 - Media resource locator, a URI for multimedia
 - Multiple rocket launcher
 - Murphy Roths large, a strain of mouse, having remarkable tissue regeneration abilities
 - Machine room-less elevators
 
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