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
 * NLO (magazine), Russian print issue
 * Nonlinear optics material
 * Norman Lockyer Observatory, Sidmouth, Devon, England
 * Nuffield Laboratory of Ophthalmology, Oxford, England