L3, L03, L.3 or L-3 may refer to:
In arts and media Live, Loud & Local, a show launched by band The Matches in the Oakland, California region Leprechaun 3, a film L3-37, a droid in Solo: A Star Wars Story Lower third, in television and film a graphic overlay placed in the title-safe lower area of the screen.
Businesses L3 Technologies, an American electronics and defence company L3Harris Technologies, the successor to L3 Technologies following the merger with Harris Corporation in 2019 DHL De Guatemala (IATA code L3), a cargo airline based in Guatemala LTU Austria (IATA code L3), an airline based in Austria
In science and technology Biology and medicine L3, the third lumbar vertebra, in human anatomy the third larval stage in the Caenorhabditis elegans worm development ATC code L03 Immunostimulants, a subgroup of the Anatomical Therapeutic Chemical Classification System Haplogroup L3 (mtDNA), a human mitochondrial DNA (mtDNA) haplogroup generally found in East Africa
Computing and telecommunications L-3, an L-carrier cable system developed by AT&T L3 microkernel, a microkernel operating system by German computer scientist Jochen Liedtke The Level-3 CPU cache in a computer ISO/IEC 8859-3 (Latin-3), an 8-bit character encoding L3 technical support, the highest level dealing with the most difficult or advanced problems.
Transportation Air- and spacecraft Aeronca L-3 Grasshopper, a light airplane used by the USAAF during World War II Avia L.3, an Italian plane used for training by the Regia Aeronautica Macchi L.3, a 1916 Italian biplane flying boats Soyuz 7K-L3, a crewed lunar lander design type in Russia's Soyuz space program N1/L3, the Soviet crewed lunar landing program
Other modes of transportation L3/33 and L3/35, Italian tankettes used in World War II L03, a Chevrolet Small-Block engine model Soviet submarine L-3, a 1931 Leninets class minelayer submarine SP&S Class L-3, an 1883 steam locomotives class L3 (New York City bus), a temporary bus route in New York City LNER Class L3, a class of British steam locomotives The Kingsford branch of the CBD and South East Light Rail in Sydney, Australia, is numbered L3 L3, an S-Bahn line of the Léman Express in Switzerland and France
Other uses in science and technology L3, a form of low-alloy special purpose steel L3 (CERN), one of the four detectors of the Large Electron-Positron Collider L3 (length^3), volume The third Lagrange Point in a gravitational system Latitude/Longitude Locator, an STS-32 Space Shuttle mission experiment
See also 3L (disambiguation) LLL (disambiguation) Level 3 (disambiguation) L band, radio frequencies in the electromagnetic spectrum