NBO

NBO may refer to:


 * National Bank of Oman
 * National Bank Open
 * Natural bond orbital, a model within quantum chemistry
 * Network of Buddhist Organisations
 * Network byte order
 * Niobium monoxide (NbO)
 * Non-binding opinion (disambiguation)
 * Northolt Branch Observatories
 * Jomo Kenyatta International Airport, Nairobi, Kenya