L18, L-18 or L.18 may refer to:
Vehicles
;Aircraft
*
Albatros L 18, a German biplane
*
Lockheed L-18 Lodestar, an American passenger aircraft
* L18, a United States Navy
L-class blimp
The L-class blimps were training airships operated by the United States Navy during World War II. In the mid-1930s, the Goodyear Aircraft Company built a family of small non-rigid airships that the company used for advertising the Goodyear nam ...
*
Piper L-18, an American light aircraft
;Ships
* , a submarine of the Royal Navy
* , a sloop of the Royal Navy
* , a destroyer of the Royal Navy
* , a tank landing ship of the Indian Navy
* , a
''Leninets''-class submarine
Other uses
*
60S ribosomal protein L18
*
Fallbrook Community Airpark, in San Diego County, California
*
Lectionary 18, a 12th-century, Greek manuscript of the New Testament
*
Mitochondrial ribosomal protein L18
*
Nissan L18 engine, an automobile engine
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