• Any of the national informatics olympiads used for selection to the International Olympiad in Informatics, including:
• National Olympiad in Informatics, China, a Chinese annual informatics competition
• Nation of Islam, a black Muslim spiritual and political organization
• Net operating income
• Ngozi Okonjo-Iweala, Nigerian politician

Noi can refer to:

• Naie "Noi" Kasahara of The Wallflower
• Noi the Albino, an Icelandic film by director Dagur Kári
• Noi River in Thailand
• The first-person plural subject pronoun 'Noi' in Italian and Romanian, meaning "We"