| Acronym | Definition |
|---|
| MRL | Magic Ruler (Yu-Gi-Oh cards) |
| MRL | Maximum Residue Limit |
| MRL | Mineral Resources Limited (Australia) |
| MRL | Montana Rail Link (railroad) |
| MRL | Minimal Risk Level |
| MRL | Memory Read Line |
| MRL | Microprocessor Research Lab |
| MRL | Manual Retention Latch |
| MRL | Method Reporting Limit (laboratory measurement) |
| MRL | Materials Research Laboratory |
| MRL | Missouri Right to Life (est. 1974) |
| MRL | Machine Room-Less (elevator) |
| MRL | Mobile Rocket Launcher |
| MRL | Merck Research Laboratories |
| MRL | Multiple Rocket Launcher |
| MRL | Morphologically Rich Language (computer programming) |
| MRL | Manufacturing Readiness Level |
| MRL | Murphy Roths Large (mouse strain) |
| MRL | Media Resource Locator |
| MRL | Microprocessor Research Lab (Intel) |
| MRL | Mean Residual Life |
| MRL | Monster Raving Loony (political party; UK) |
| MRL | Maintenance Requirement(s) List |
| MRL | Maximum Reservoir Level (irrigation) |
| MRL | Marine Resources Library (Charleston, SC) |
| MRL | Marzano Research Laboratory (Solution Tree) |
| MRL | Magnetic Reference Laboratory (San Jose, CA; est. 1972) |
| MRL | Manipulator Retention Latch (US NASA) |
| MRL | Music Reproduction Licence |
| MRL | McLane Research Laboratories (est. 1983; East Falmouth, MA) |
| MRL | Mississippi River Levee |
| MRL | Materiel Requirements List |
| MRL | Maritime Rear Link |
| MRL | Medical Resource LLC |
| MRL | Master Requirements List |
| MRL | Mobile Radiation Laboratory |
| MRL | Missile Rail Launcher (AMRAAM) |
| MRL | Maximum Performance Achievable Reducing Latency |
| MRL | Main Rotor Linkage (Helicopter) |
| MRL | Maxwell Rotors Limited |
| MRL | Mullard Research Laboratory (Leeds University) |
| MRL | Modified Reporting Limit (laboratory quality assurance) |
| MRL | Motueka River Lodge (New Zealand Luxury Accommodation) |