| Acronym | Definition |
|---|
| LEC | Local Exchange Carrier (telephony) |
| LEC | Long Evans Cinnamon (rat species) |
| LEC | Lodge Executive Committee Meeting (Order of the Arrow, Tamegonit Lodge 147, Heart of America Council, Boy Scouts of America) |
| LEC | Language Engineering Company, LLC (Belmont, Massachusetts) |
| LEC | Local Engineering Competition (Board of European Students of Technology; Aalborg University; Denmark) |
| LEC | Layered Error Correction |
| LEC | Lockheed Electronics Company |
| LEC | Lunar Equipment Conveyor |
| LEC | Liquid Encapsulated Czochralski Method (semiconductors) |
| LEC | Low Emissions Combustion |
| LEC | Local Employment Committee |
| LEC | LAMPS Element Coordinator |
| LEC | Levelised Electricity Costs (power plants) |
| LEC | Liquid Encapsulated Czochralsky (crystal growth method) |
| LEC | Local Engineering Change |
| LEC | Light Earth Construction (building) |
| LEC | Laboratory Emergency Coordinator |
| LEC | Logical Equivalence Check (engineering, electronics, design automation, formal verification) |
| LEC | Link Edit Control |
| LEC | Least Economic Countries |
| LEC | LANTCOM ELINT Center |
| LEC | Launch Escape Control |
| LEC | Lumped Element Circulator |
| LEC | Lafayette Educational Complex (Brooklyn, NY) |
| LEC | London Euston Crewe (UK engineers line reference) |
| LEC | Livestock Equipment Council |
| LEC | Learner's Edge Consulting |
| LEC | Leading Edge Consulting, LLC |
| LEC | Locally Employed Civilian |
| LEC | Levy Exemption Certificate (UK) |
| LEC | Local Emergency Coordinator |
| LEC | Line Echo Cancellation |
| LEC | Little East Conference (athletics) |
| LEC | LucasArts Entertainment Company LLC (computer game company) |
| LEC | Law Enforcement Committee |
| LEC | Lens Epithelial Cell (ophthalmology) |
| LEC | Library Executive Committee |
| LEC | Limited Editions Club (est. 1929; books) |
| LEC | Language Engineering Company (translation software) |
| LEC | Laredo Entertainment Center (Laredo, TX) |
| LEC | Local Exchange Companies |
| LEC | Law Enforcement Command |
| LEC | LAN Emulation Client |
| LEC | Landmark Education Corporation |
| LEC | Liberia Electricity Corporation (Liberia) |
| LEC | Lake Erie College |