LAC may refer to:
- Los Angeles County in California
- La Crescenta, California, unincorporated area in Los Angeles County
- California State Prison, Los Angeles County
- Line of Actual Control, effective border between India and China
- Latin America and the Caribbean, United Nations geoscheme region
- Longburn Adventist College, Christian school in Longburn, New Zealand
- Lancashire Aero Club, flying club in the United Kingdom
- Lockheed Aircraft Company, American aerospace company
- Lignes Aériennes Congolaises (defunct airline of the Democratic Republic of the Congo)
- LAC, the ICAO operator designator for Lockheed Aircraft Corporation, United States.
- Líneas Aéreas Canarias
Sports and entertainment
- Ladies' Alpine Club (1907–1975), a club for women climbers, based in London, merged in 1975 with the Alpine Club
- Law Abiding Citizen, a 2009 film starring Jamie Foxx and Gerard Butler
- Los Angeles Clippers, a team in the National Basketball Association
- Los Angeles Chargers, a team in the National Football League
- Leading Aircraftman, a rank in some air forces
- Liberal arts college, undergraduate educational institution
- Library and Archives Canada, national memory institution preserving documentary heritage about Canadian life
- Local Area Commands, a unit in Australian police system.
- Location Area Code, unique number broadcast by a "base transceiver station" in GSM
- L2TP Access Concentrator, endpoint of a Layer 2 Tunneling Protocol tunnel
- Linear acetylenic carbon, a polymeric carbon chain
- LAC Minerals, a Canadian mining company
- Lorenz asymmetry coefficient, a statistic used in the analysis of wealth or income inequality
- Language Atlas of China, an atlas mapping the distribution of languages in China
- LAC Cargo, a logistics company located in Uruguay
- Granada LAC, a BRT system in the city of Granada, (Spain)
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