L3

L3 or L-3 may refer to:
* L3/33 and L3/35, Italian tankettes used in World War II
* L3 (CERN), one of the four detectors of the Large Electron-Positron Collider
* L-3 Communications, a company providing intelligence, surveillance, and reconnaissance systems
* L3 microkernel, an Intel microkernel and the predecessor of the L4 microkernel family
* Aeronca L-3 Grasshopper, a light airplane used by the USAAF during World War II
* Haplogroup L3 (mtDNA), a human mitochondrial DNA (mtDNA) haplogroup generally found in East Africa
* SP&S Class L-3, a 1883 steam locomotives class
* The third Lagrange Point in a Solar System
* The third lumbar vertebra of the vertebral column, in human anatomy
* Level-3 CPU cache in a computer
* Latitude/Longitude Locator, an STS-32 Space Shuttle mission experiment
* DHL De Guatemala (IATA code: L3), a cargo airline based in Guatemala
* LTU Austria (IATA code: L3), an airline based in Austria
* LK Lander, a manned lunar lander design type in Russia's Soyuz space program
** Soyuz L3, a related Lunar Orbiter which suffered launch failure on November 23, 1972.

ee also

* LLL