| Acronym | Definition |
|---|
| LET | Letter (File Name Extension) |
| LET | Ladies European Tour (golf) |
| LET | Linear Energy Transfer |
| LET | Law Enforcement Training (various locations) |
| LET | Lashkar-E-Taiba (terrorist organization in Pakistan) |
| LET | Lean Enterprise Transformation |
| LET | Learning, Education and Training (Internet technologies) |
| LET | Leading Edge Technologies |
| LET | Leaving Early Today (office correspondence) |
| LET | Leadership Executive Team (various organizations) |
| LET | Law Enforcement Team |
| LET | Licensure Examination for Teachers (Philippines) |
| LET | Live Entertainment Tax |
| LET | Light Emitting Transistor |
| LET | Leadership Education Training (JROTC cadet years in the program) |
| LET | Lead Employer Trust (UK) |
| LET | Lepidoptera of Ethiopia |
| LET | Low Energy Telescope (NASA) |
| LET | Leukocyte Esterase Test |
| LET | Light Equipment Transporter |
| LET | Lake Erie Transit (Monroe, MI) |
| LET | Leading Edge Tracking |
| LET | Lidocaine, Epinephrine and Tetracaine (topical anesthetic) |
| LET | Les Enfant Terrible (gaming, Metal Gear Solid) |
| LET | Line Equipment Transfer |
| LET | Logistics Escape Trunk |
| LET | Logistics Escape Trunk (US Trident Submarine SSBN 726 Class) |
| LET | Launch Effects Trainer |
| LET | Last Expected Time |
| LET | Logical Equipment Table |
| LET | Light Emitting Triode (electronics) |
| LET | Leticia, Colombia - Gen Av Cobo (Airport Code) |
| LET | Level Electrical Transmitter |
| LET | Logical Exchange Termination (Cisco) |