OOL

OOL may refer to:

Science and technology

 * Object-oriented language, a programming paradigm
 * OoL (Origins of life), Abiogenesis
 * Out-of-the-loop performance problem, a consequence of automation

Others

 * Gold Coast Airport (IATA code) in Gold Coast, Queensland, Australia
 * Olivia O'Leary, Irish journalist, writer and current affairs presenter
 * Optimum Online, an Internet service provider in the United States