LU
- lu – (s) Tshiluba language (ISO 639-1 code)
- Lu – (s) Lutetium
- LU – Loonatics Unleashed
- lub – (s) Tshiluba language (ISO 639-2 code)
- LUCA – (a) Last Universal Common Ancestor
- lug – (s) Luganda (ISO 639-2 code)
- LUG – (i) Linux User Group
- LULU – (a) Locally Unwanted Land Use (urbanism)
- LUT – (i) Limited User Test (ing) – Local User Terminal
- LUVW – (i) Light Utility Vehicle, Wheeled
- LUX – (s) Luxembourg (ISO 3166 trigram)
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