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), ''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 (band), Rize * "K.O.", a 2004 song by Smujji

Other media

* Ko (Go), in the board game ''Go'' * Ko (film), ''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 * 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 * Cody Ko, shortened stage name of Canadian comedian and internet celebrity Cody Michael Kolodziejzyk (born 1990)

People

* K.O (rapper), 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, 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