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 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 General Motors L18 engine, an automobile and boat engine.