Ko
- Alaska Central Express
- Civic Coalition (Poland)
- Civic Coalition (party)
- Contracting Officer
- Dukkha
- Gao (surname)
- Gene knockout
- Gong (disambiguation)
- International Society for Knowledge Organization
- Japanese incense
- John Kelly Limited
- K.O (rapper)
- K.O. (album)
- K.O. (song)
- K0 (disambiguation)
- KO
- KO (musician)
- KO (song)
- Karen O
- Karen Olivo
- Kayo (disambiguation)
- Ke (surname)
- Keio University
- Kemetic Orthodoxy
- Kevin Olusola
- Kevin Owens
- Kick-off (association football)
- Knight Online
- Knockout (disambiguation)
- Knowledge organization
- Ko (Go)
- Ko (Korean surname)
- Ko (film)
- Ko (kana)
- Ko (soundtrack)
- Ko Mountain
- Ko Simpson
- Ko language
- Ko, Lamphun
- Ko. Madhepura
- Korean language
- Kosovo
- Kou (disambiguation)
- Kö
- Kō Station (Aichi)
- Kō Station (Tokushima)
- Kōdō
- Loadable kernel module
- Momofuku Ko
- OK K.O.! Let's Be Heroes
- Real K-theory
- Rize (band)
- Smujji
- TKO (disambiguation)
- The Coca-Cola Company
- Xu (surname 許)
- Yi Ko