LGL may refer to: Codes LGL, the IATA airport code for Long Lellang Airport, Long Lellang, the state of Sarawak in Malaysia LGL, the ICAO airline code for Luxair, the flag carrier airline of Luxembourg lgl, the ISO 639-3 three-letter language code for Langalanga language Science Biology Large granular lymphocyte, a type of white blood cell in the immune system Lown–Ganong–Levine syndrome, a heart disease when the ventricles are pre-excited due to abnormal electrical communication from the atria to the ventricles Organizations Lycée de Garçons de Luxembourg (Luxembourg Boys' High School), a high school in Luxembourg City, Luxembourg Lithuanian Gay League Ladies Gridiron League, an Australian-based non-for-profit company running a full contact, 7-a-side, women's American football league Science and technology Computing Large Graph Layout (see), a set of applications to ease the visualization of large networks and graphs Mathematics Gauss–Lobatto–Legendre nodes (points) and weights Companies LGL Limited (see). A private research and consulting firm formed in 1971 and named after the company's three founding partners, A. Lewis, W.W.H. Gunn, and J.A. Livingston