Lub
Lub or LUB may refer to:

 Supremum, least upper bound
 Lub, Oman
 Liga Uruguaya de Basketball (LUB)
 Liub (also known as Lub), a 9th-century ruler of Veleti tribe
 Lumid Pau Airport (IATA: LUB), an airport serving the village of Lumid Pau, Upper Takutu-Upper Essequibo Region. Guyana