MRL

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