LK

LK or lk may refer to:

Businesses and organizations

 * Air Luxor, IATA airline code
 * Marking of Latin Kings (gang)
 * Luckin Coffee, Chinese coffee house chain (former NASDAQ ticker lk)

Science and technology

 * System LK, in mathematics, the classical sequent calculus
 * LK (spacecraft), a Soviet lunar lander

Other uses

 * LK (index mark code), county Limerick, Ireland, vehicle registration
 * LK I, a German light tank prototype of the World War I
 * LK II, a German light tank of World War I
 * LK-700, a Soviet direct ascent lunar lander program proposed in 1964
 * The LK, a Swedish indie band
 * Sri Lanka (ISO 3166-1 alpha-2 country code LK)
 * .lk, Internet top-level domain for Sri Lanka
 * En-LK, Sri Lankan English