OOL may refer to:
Science and technology
- Object-oriented language, a programming paradigm
- Origin of life (OoL), also called 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
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