L12

L12 may refer to:

Ships and boats

 * HMS L12, a submarine of the Royal Navy
 * HMS Albrighton (L12), a destroyer of the Royal Navy
 * HMS Ocean (L12), a helicopter carrier of the Royal Navy
 * HMS Sandwich (L12), a sloop of the Royal Navy
 * SOVIET SUBMARINE L-12, a Leninets-class submarine

Other uses

 * Lectionary 12, a 12th-century, Greek manuscript of the New Testament
 * Liberty L-12, an American aircraft engine
 * Lockheed L-12 Electra Junior, an American passenger aircraft
 * LSWR L12 class, a class of steam locomotives
 * TEDOM L 12, a Czech bus
 * L-12, an L-class blimp of the United States Navy