Lu or Lü may refer to:
Luxembourg () (Luxembourgish: Lëtzebuerg [ˈlətsəbuːə̯ɕ]; German: Luxemburg), officially the Grand Duchy of Luxembourg, is a landlocked country in western Europe.
Ludwig van Beethoven (, ; German: [ˈluːtvɪç fan ˈbeːtˌhoˑfn̩]; baptised 17 December 1770 – 26 March 1827) was a German composer and pianist.
Lumber (American English; used only in North America) or timber (used in the rest of the English speaking world) is a type of wood that has been processed into beams and planks, a stage in the process of wood production.
Lutheranism is a major branch of Protestant Christianity which identifies with the theology of Martin Luther (1483–1546), a German friar, ecclesiastical reformer and theologian.
The lungs are the primary organs of the respiratory system in humans and many other animals including a few fish and some snails.
Lung cancer, also known as lung carcinoma, is a malignant lung tumor characterized by uncontrolled cell growth in tissues of the lung.
Lucifer (, LOO-sif-ər), is a name that, according to dictionaries of the English language, refers to the Devil (Satan) or to the planet Venus when appearing as the morning star.