L5

L5 or L-5 may be:
* L5 (band), a French female pop music group
* L-5 Sentinel, an aircraft used by the United States Army Air Forces in World War II
* L5 Society, a society promoting space colonization ideas of Dr. Gerard K. O'Neill
* Gibson L5, an electric guitar in Musical instruments
* SP&S Class L-5, a 1897 steam locomotives class

; other :
* Lufttransport A/S IATA airline designator
* A light-weight file integrity checker for DOS or Unix. [http://www.securityfocus.com/tools/13]
* A frequency used in GPS satellite navigation signals, see GPS signals
* Fifth lumbar vertebra of the vertebral column, in human anatomy
* fifth Lagrange Point in an astronomical Solar System
* The filk song Home on Lagrange (The L5 Song)