| Acronym | Definition |
|---|
| TRL | Trail |
| TRL | Total Request Live (MTV program) |
| TRL | Total Request Live |
| TRL | Trailer |
| TRL | Toll-Like Receptor (proteins) |
| TRL | Turkey Lira (Currency Unit, ISO) |
| TRL | Temporary Residence Limited (record label; New York, NY) |
| TRL | Tomb Raider Legend (video game) |
| TRL | Transport Research Laboratory (UK) |
| TRL | Technology Readiness Level (US Army) |
| TRL | Thin Red Line |
| TRL | Transaction Rate Limiting |
| TRL | Telecommunications Research Laboratory (various locations) |
| TRL | Teaching Resources Library (Australia) |
| TRL | Tree-Ring Laboratory (various locations) |
| TRL | Technology Research Laboratories (various locations) |
| TRL | Touchstone Research Laboratory |
| TRL | Timberland Regional Library (Washington state) |
| TRL | Toronto Reference Library (Canada) |
| TRL | Translational Research Ltd. (Japan) |
| TRL | Tanabe Research Laboratories (Mitsubishi Tanabe Pharmaceutical Corporation) |
| TRL | Texas Right to Life |
| TRL | Thru-Reflect-Line |
| TRL | Total Recall Learning (courses; various locations) |
| TRL | Telstra Research Laboratories (Australia) |
| TRL | Technical Research Limited (currency forecaster, New Zealand) |
| TRL | Test Research Laboratories (Japan) |
| TRL | Toolworks Reference Library |
| TRL | Technical Reference Library (Telcordia) |
| TRL | Transistor Resistor Logic |
| TRL | Trade Resources Ltd. (Chicago, IL) |
| TRL | Tape Rental Library |
| TRL | Telemetry Return Link |
| TRL | Tritium Research Laboratory |
| TRL | Transport Resource List |
| TRL | Transverse Return Loss (ITU-T) |
| TRL | Transmitter Return Loss |
| TRL | Target Requirement List |
| TRL | TMN Reference Layer |
| TRL | Turbine Runback Limit |
| TRL | Turbine Rated Load |
| TRL | Trading Rule Language |
| TRL | Triple Random Length (pipeline systems) |