No and variants may refer to:

• One of a pair of English words, yes and no, which signal confirmation or a negative response respectively
• One of the English determiners

Nô may refer to:

• Noh, a form of Japanese musical drama
• Nô (film), a 1998 film which uses Noh theatre as a dramatic device

is the Internet country code top-level domain (ccTLD) for Norway. Norid, the domain name registry, is based in Trondheim, is owned by the state-owned Uninett and operates under supervision of the Norwegian Post and Telecommunications Authority. As of May 10, 2013 there were 583,962 registered -domains. Organizations with a presence in Norway and registration at the Brønnøysund Register Centre are limited to 100 domains each. Individuals residing in Norway may register in the second-level domain  and, as of June 17, 2014, directly under . Other second-level domains exist for organizations of certain types, such as municipalities and schools. The strict regulations have resulted in near-absence of cybersquatting and warehousing.

NOH may refer to:

• New Orleans Hornets
• Nitroxyl
• New Oriental Hotel

The nitrosonium ion is NO⁺, in which the nitrogen atom is bonded to an oxygen atom with a bond order of 3, and the overall diatomic species bears a positive charge. This ion is usually obtained as the following salts: NOClO₄, NOSO₄H (nitrosylsulfuric acid, more descriptively written ONSO₃OH), and NOBF₄. The and salts are slightly soluble in CH₃CN. NOBF₄ can be purified by sublimation at 200–250 °C and .

No! is the first children's album by the alternative rock band They Might Be Giants, released in 2002 on Rounder Records and Idlewild Recordings.

, or —derived from the Sino-Japanese word for "skill" or "talent"—is a major form of classical Japanese musical drama that has been performed since the 14th century. Developed by Kan'ami and his son Zeami, it is the oldest major theatre art still regularly performed today. Traditionally, a Noh program includes five Noh plays with comedic kyōgen plays in between, even though an abbreviated program of two Noh plays and one kyōgen piece has become common in Noh presentations today. An okina (翁) play may be presented in the very beginning especially during New Years, holidays, and other special occasions.