| Acronym | Definition |
|---|
| MTL | Montreal (Canada) |
| MTL | Montreal |
| MTL | Metal |
| MTL | Machine Translation (computing) |
| MTL | Maltese Lira (ISO currency code) |
| MTL | Mouth to Lung (vaping) |
| MTL | Monatlich (German: monthly) |
| MTL | Mean Tide Level |
| MTL | Micro Trains Line (maker of N and Z scale model trains) |
| MTL | Multi-Task Learning |
| MTL | Manufacturing Team Leader |
| MTL | Motion Time Lapse (film technique) |
| MTL | Materials Testing Laboratory (various locations) |
| MTL | Materials Technology Laboratory |
| MTL | Mathematical Thinking and Learning |
| MTL | Mighty Leaf Tea |
| MTL | Mother Tongue Language |
| MTL | More To Life |
| MTL | Medial Temporal Lobe (brain) |
| MTL | Malawi Telecommunications Limited |
| MTL | Minimum Trigger Level |
| MTL | Microprocessor Technology Lab |
| MTL | Master Testing List |
| MTL | Message Transfer Layer |
| MTL | Merged Transistor Logic |
| MTL | Material Library |
| MTL | Mail Traffic Limiter |
| MTL | Materials Toolkit |
| MTL | Mobile Technology Lab |
| MTL | Matrix Template Library |
| MTL | Microsystems Technology Laboratories |
| MTL | Main Telephone Line |
| MTL | Math Teacher Link |
| MTL | More Than Likely |
| MTL | Movimiento Territorial de Liberación (Spanish: Territorial Liberation Movement; Argentina) |
| MTL | Modern Terminals Limited |
| MTL | Multiconductor Transmission Line |
| MTL | More to Love |
| MTL | Military Training Leader |
| MTL | My True Love |
| MTL | Mission Tasking Letter (US DoD) |
| MTL | Message Transfer Layer (ITU-T) |
| MTL | Maximum Tolerated Dose |
| MTL | Metric Temporal Logic (computer science) |
| MTL | Medium-Term Loan |
| MTL | Minimum Triggering Level (DO 181C RTCA specification) |
| MTL | Microstrip Transmission Line |
| MTL | Moderate Temperature Loop |
| MTL | More Taste League (beer commercial) |
| MTL | More Than Love |
| MTL | Master Target List |
| MTL | Modal Transmission-Line (method) |
| MTL | Mission Time Line |
| MTL | Master Task Listing |
| MTL | Master Training List |
| MTL | Multisetting Torque Limiter |
| MTL | Master Tracking List |
| MTL | Manual Tie Line |
| MTL | Master Tool List |
| MTL | Mean Track Life |
| MTL | Maximum Token Latency (networks) |
| MTL | Minimum Termination Liability (Sprint) |
| MTL | Mean Traffic Load |
| MTL | Mobile Telephone Laboratory |
| MTL | Mechanically Tuned Laser (IEEE) |
| MTL | Moving Target Locator |
| MTL | Miller Taste League (beer advertisement) |
| MTL | Metal Tiles Ltd (UK) |