NIO or Nio may refer to: Nio, guardians of the Buddha Nio Inc., a Chinese electric automobile manufacturer Nicaraguan córdoba, currency by ISO 4217 currency code National Institute of Oceanography (disambiguation), several organizations National Institute of Ophthalmology (disambiguation), several organizations Neurotechnology Industry Organization Non-blocking I/O (usually "NIO"), a collection of Java programming language APIs introduced with the J2SE 1.4 release of Java by Sun Microsystems Northern Ireland Office, an arm of the United Kingdom government, responsible for Northern Ireland affairs Nickel(II) oxide, NiO Liang (surname), pronounced and romanized as Nio in several southern Chinese variants See also Ios (aka: Nios, ), an island in Greece Nios (disambiguation)