L12 may refer to:
Ships and boats , a submarine of the Royal Navy , a destroyer of the Royal Navy , a helicopter carrier of the Royal Navy , a sloop of the Royal Navy , 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