NLO

NLO may refer to:

• Fernald Feed Materials Production Center
• Naval Live Oaks Reservation, Florida, United States
• New London Orchestra, London, England
• Next to Leading Order, in the scientific context; see {{slink|Leading-order term|Next-to-leading order}}
• NLO (magazine), Russian print issue
• Nonlinear optics material
• Norman Lockyer Observatory, Sidmouth, Devon, England
• Nuffield Laboratory of Ophthalmology, Oxford, England
• NLO TV, a defunct Ukrainian television channel