UOL is an abbreviation for:
- Buol Airport, the airport in Buol, New Guinea, Indonesia after the IATA code
- University of Leeds, a University in Leeds, UK.
- University of London, see University of London, one of the oldest universities in the United Kingdom and one of the largest in the world
- , Listed Universo Online, an online service and Internet service providers in the financial index IBOVESPA
- Upper operating limit, upper temperature threshold at HALT tests in which the specimen is still working, see Highly Accelerated Life Test # test result and end