Lec or LEC may refer to:
- Organisations
- Lake Erie College, a College in Painesville, Ohio
- Lancaster Environment Centre, Lancaster University, UK
- Language Evolution and Computation Research Unit, at the University of Edinburgh
- Lao Evangelical Church in Laos
- Laredo Entertainment Center sports arena in Laredo, Texas
- LEC Refrigeration, former British white goods manufacturer now part of Glen Dimplex
- LEC Refrigeration Racing, British Formula One constructor associated with the above company
- Living Enrichment Center, a defunct New Thought church in Wilsonville, Oregon
- Lonsdale Energy Corp Centralized Heating Provider, North Vancouver, British Columbia, Canada
- LucasArts Entertainment Company, George Lucas' computer game company
- Places
- Lec, former name of Giżycko, city in Poland
- Lake City (Amtrak station), Florida, United States; Amtrak station code LEC
- Stari Lec, village in Serbia
- Other
- Lee-Enfield Cavalry Carbine Mk I
- Legal Education Certificate, professional certification allowing its holder to practice law in the Commonwealth Caribbean
- Levelised energy cost, the average whole-lifetime cost of electricity from a power plant.
- Levy Exemption Certificate - UK Climate Change Levy
- Light emitting capacitor
- Light-emitting Electrochemical Cell
- liquid encapsulated Czochralski
- Liver-expressed chemokine, a small chemokine also known as CCL16
- Local enterprise company, Scotland
- Local exchange carrier, a type of telecommunication service provider
- Logic equivalence checking, or Formal equivalence checking, a process in Electronic design automation
- Lunar Equipment Conveyor, a device used on Apollo space missions to the moon to ferry equipment and samples in and out of the Lunar Module
- Stanisław Jerzy Lec (1909–1966), Polish aphorist