What is "nio"

NIO or Nio may refer to:

• Nio, guardians of the Buddha
• Nicaraguan córdoba, ISO 4217 currency code for the national currency of Nicaragua
• 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