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
 - 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., 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 Tamil action movie
 - 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), a surname of Chinese Xu and customarily spelled as Ko
 
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)
 
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
 - 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
 
See also
- All pages with titles beginning with Ko
 - All pages with titles containing Ko
 - TKO (disambiguation)
 - Kayo (disambiguation)
 - Knockout (disambiguation)
 - K0 (disambiguation)
 - Kou (disambiguation)
 - Gong (disambiguation), called Ko in Japanese
 
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