# Ko

A KO is a knockout in various sports, such as boxing and martial arts.
K.O., Ko or Kō may also refer to:

## Arts and entertainment
### Music

* KO (musician), Canadian musician who plays a fusion of hip hop and folk music
* K.O. (album), a 2021 album by Danna Paola
* Ko (soundtrack), for the 2011 Indian film (see below) by Harris Jayaraj
* K.O (rapper), South African rapper Ntokozo Mdluli
* Karen O (born 1978), lead singer of the rock group Yeah Yeah Yeahs
* Kevin Olusola, American cellist, beatboxer and member of a cappella group Pentatonix
* K.O. (song), a song by Pabllo Vittar
* K.O., a 2008 album by Rize
* "K.O.", a 2004 song by Smujji

### Other media

* Ko (Go), in the board game Go
* Ko (film), a 2011 Indian Tamil-language action film by K. V. Anand
* Knight Online, a 2004 online role-playing game

## Language

* Ko language
* Ko (kana), the romanization of the Japanese kana こ and コ
* ISO 639-1 code for the Korean language

## Surname

* Ko (Korean surname)
* Gao (surname), a surname of Chinese origin romanized to Ko in Hong Kong, and in several romanizations especially in South-east Asia
* Ke (surname), a Chinese surname romanized as "Ko" in the Wade–Giles system
* Xu (surname 許), a surname of Chinese romanized as Ko in the Teochew dialect

## People

* K.O (rapper) South African musician and businessman
* KO (musician), Canadian musician who plays a fusion of hip hop and folk music
* Ko Simpson (born 1983), professional American football player for the Buffalo Bills
* Kevin Owens, Canadian professional wrestler

## Places

* Ko Mountain, the second-highest peak in the Sikhote-Alin Mountains of Russia
* Ko. Madhepura, Nepal, a village development committee
* Ko, Lamphun, Thailand, a village and subdistrict
* Kö, an urban boulevard in Düsseldorf, Germany

## Science and technology

* Ko, an ancient Chinese weapon also known as a dagger-axe in English
* Kō, a version of the foot plough used by the Māori people
* Gene knockout, a molecular biology genetic technique, abbreviated KO
* Knowledge organization, branch of information science
** Knowledge Organization, an academic journal published by the International Society for Knowledge Organization
* kilooctet (computing), a unit of information or computer storage
* Loadable kernel module (file extension .ko)
* Real K-theory

## Transportation

* Kō Station (Aichi) on the Meitetsu Nagoya Main Line in Japan
* Kō Station (Tokushima) on the Tokushima Line in Japan
* Alaska Central Express, IATA airline designator

## Other uses

* The Coca-Cola Company, stock ticker symbol and corporate internet domain ko.com
* Civic Coalition (Poland), or Koalicja Obywatelska (KO), a Polish electoral alliance
* Knock-off, a counterfeit product
* Kelly Oils Ltd, a fuels merchant in Northern Ireland
* Kemetic Orthodoxy, a religion
* Contracting Officer, US government acronym KO or CO
* K.O., protagonist in OK K.O.! Let's Be Heroes
* Ko Ukumori, a character in the air combat game The Sky Crawlers: Innocent Aces
* Dukkha, the concept of unsatisfactoriness in Buddhism
* Kick-off (association football), the time or manner of start of play
* Kō, Japanese for incense; see Japanese incense
** Kōdō, the art of appreciating Japanese incense
* Momofuku Ko, a New York restaurant