NIO or Nio may refer to:
- NIO (car company), a Chinese-American electric automobile manufacturer
- 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
|This disambiguation page lists articles associated with the title NIO.
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