On, on, or ON may refer to:
Ontario ( ( listen); French: [ɔ̃taʁjo]) is one of the 13 provinces and territories of Canada and is located in east-central Canada.
One World Trade Center (also known as 1 World Trade Center, 1 WTC, or Freedom Tower) is the main building of the rebuilt World Trade Center complex in Lower Manhattan, New York City.
One Direction are an English-Irish pop boy band based in London, composed of Niall Horan, Liam Payne, Harry Styles, Louis Tomlinson, and, until his departure from the band in 2015, Zayn Malik.
One Thousand and One Nights (Arabic: أَلْف لَيْلَة وَلَيْلَة, translit. ʾAlf layla wa-layla) is a collection of Middle Eastern folk tales compiled in Arabic during the Islamic Golden Age.
Online advertising, also called online marketing or Internet advertising or web advertising, is a form of marketing and advertising which uses the Internet to deliver promotional marketing messages to consumers.
Online shopping is a form of electronic commerce which allows consumers to directly buy goods or services from a seller over the Internet using a web browser.
On-board diagnostics (OBD) is an automotive term referring to a vehicle's self-diagnostic and reporting capability.