UG may refer to:
- U. G. Krishnamurti (1918–2007), a speaker and philosopher
- Unidade Galega, a Galician nationalist and social democratic political coalition
- Uganda (ISO 3166-1 alpha-2 and top-level domain country code)
- Ug (book), a children's book by Raymond Briggs
- Ultimate Guitar Archive, a large guitarist community website
- Universal grammar, a theory of linguistics postulating principles of grammar
- Uyghur language (ISO 639-1 language code)
- Gravitational potential energy (Ug), potential energy associated with gravitational force
- Sevenair (IATA code is UG), an airline based in Tunisia
- Universal Genève, a Swiss watch company
- User guide or user's guide, an instruction manual
- Utility graph, a mathematical graph used in the "water, gas, and electricity" problem
Read more about UG: Universities