Koo or KOO may refer to:
Kōō (1389–1390), a Japanese era KOO, a South African food brand Koo (social network), an Indian microblogging and social networking service Koo Koo, a 1981 Debbie Harry album Kõo, village in Viljandi County, Estonia
People Koo Chen-fu (1917–2005), Taiwanese businessman and diplomat Koo Chung, Korean-American singer-songwriter Koo Dae-Sung (born 1969), South Korean baseball player Koo Hsien-jung (1866–1937), Taiwanese businessman and politician Koo Ki-Lan (born 1977), South Korean volleyball player Koo Kien Keat (born 1985), Malaysian badminton player Koo-Koo the Bird Girl, who suffered from Virchow-Seckel syndrome Koo Stark (born 1956), American film actress and photographer Koo Hye-sun, a South Korean actress and singer Jeffrey Koo Sr. (born 1933), Taiwanese banker Joseph Koo, MBE, SBS, (born 1933,), Hong Kong composer Josephine Koo (Chinese: 顧美華), Chinese actress Kaija Koo (born 1962), Finnish singer Linda Koo (born 1954), Hong Kong epidemiologist Louis Koo, Hong Kong actor Koo Sze-yiu, Hong Kong activists Wellington Koo, Chinese diplomat Younghoe Koo, American football player
Fictionals Hari Koo, a protagonist in the anime series Doori Koo, a protagonist in the anime series
See also Koo-Vee, a Finnish ice hockey team based at Tampere Koo-Vee (ice hockey), a Finnish ice hockey team based at Tampere Nathan Koo-Boothe (born 1985), English-Jamaican footballer
Tai Koo (disambiguation)