{{Distinguish|text=K0 (K followed by zero)}} {{Wiktionary|KO|Ko|Kō|Appendix:Variations of "ko"}}'''KO''' is a knockout in various sports, such as boxing and martial arts. '''K.O.''', '''Ko''' or '''Kō''' may also refer to: {{TOC right}}
==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 * KO (song), 2025 song by NLE Choppa * ''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
==People== * Kō Nakata (born 1960), Japanese Islamic scholar * Ko Simpson (born 1983), professional American football player for the Buffalo Bills * Kevin Owens, Canadian professional wrestler * Yi Ko (died 1171), Korean military ruler * Karen Olivo, an American actor, theater educator, and singer
==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 * KO, a country code often associated with Kosovo (Mostly used with XK) * Keio University, a university in Tokyo, Japan
==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 * Railway line prefix KO of Keio lines
==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 ** or Civic Coalition (party), a Polish political party of the same name * 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
==See also== * {{lookfrom}} * {{intitle}} * TKO (disambiguation) * Kayo (disambiguation) * Knockout (disambiguation) * K0 (disambiguation) * Kou (disambiguation) * Gong (disambiguation), called ''Ko'' in Japanese
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