LI
- li – (s) Limburgish language (ISO 639-1 code)
- Li – (s) Lithium
- LI – (s) Fifty-one (in Roman numerals) – (s) Liberia (FIPS 10-4 country code) – Liechtenstein (ISO 3166 digram)
- LIBOR – (p) London Interbank Offered Rate
- LIBS – (a) Laser Induced Breakdown Spectroscopy
- LIE – (s) Liechtenstein (ISO 3166 trigram)
- LIFO – (a) Last In, First Out
- LIGO – (a) Laser Interferometer Gravitational-Wave Observatory
- lim – (s) Limburgish language (ISO 639-2 code)
- lin – (s) Lingala language (ISO 639-2 code)
- LINEAR – (a) Lincoln Near-Earth Asteroid Research
- LiP, LIP – (s) Lithium ion polymer battery
- LISA – (a) Laser Interferometer Space Antenna
- lit – (s) Lithuanian language (ISO 639-2 code)
- LITAS – (a) Low Intensity Two Colour Approach System (aviation)
- LIVE – (a) Liquid Inertial Vibration Eliminator
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