- Source: Koga (surname)
Koga (written: 古賀), Kōga, Kouga or Kohga is a Japanese surname. Notable people with the surname include:
Akira Koga (古賀 輝, born 1994), Japanese badminton player
Aoi Koga (古賀 葵, born 1993), Japanese voice actress
Atsushi Koga (古賀 淳, born 1993), Japanese former rugby union player
Harue Koga (古賀 春江, 1895-1933), Japanese painter active in the Taishō period
Hide Koga, nickname of Hidehiko Koga (古賀 英彦, 1899-1982), Japanese baseball player
Hiroyasu Koga (古賀 浩靖, born 1947), Yukio Mishima's kaishakunin
Issaku Koga (古賀 逸策, 1899-1982), often written as Issac Koga, Japanese inventor and scientist
Issei Koga (古賀 一成, born 1947), Japanese politician from Democratic Party of Japan
Junya Koga (古賀 淳也, born 1987), Japanese swimmer
Kazunari Koga (古賀 一成, born 1972), Japanese former footballer
Keitaro Koga (古賀 鯨太朗, born 1991), former Japanese footballer
Koichiro Koga (古賀 幸一郎, born 1984), Japanese volleyball player
Makoto Koga (古賀 誠, born 1940), Japanese Liberal Democratic Party politician
Manabu Koga (古賀 学, 1935-74), Japanese swimmer
Mary Koga (1920-2001), Japanese-American photographer and social worker in Chicago
Masahiro Koga (古賀 正紘, born 1978), Japanese former footballer
Masao Koga (古賀 政男, 1904-1978), was a Japanese composer, guitarist and pop musician
Masato Koga (古賀 将之, born 1970), a former Japanese football player
Masayuki Koga (古賀 正人), a Japanese shakuhachi player in USA
Michiko Koga (古賀 美智子, born 1986) is the former stage name of F Chopper Koga (FチョッパーKOGA), Japanese bass player
Mineichi Koga (古賀 峯一, 1885-1944), Fleet Admiral during World War II
Minoru Koga (古賀 穂, born 1996), Japanese badminton player
Mitsuki Koga (虎牙 光揮, born 1975), actor in martial arts films
Nobuaki Koga (古賀 伸明, born 1952), Japanese unionist
Sarina Koga (古賀 紗理那, born 1996), Japanese volleyball player
Satoshi Koga (古賀 聡, born 1970), Japanese footballer
Seiji Koga (古賀 誠史, born 1978), Japanese footballer
Shuntaro Koga (古賀 俊太郎, born 1998), Japanese footballer
Tadayoshi Koga (古賀忠義), pilot of the Akutan Zero in World War II
Taichirō Koga (古賀 太一郎, born 1989), Japanese volleyball player
Taiyo Koga (古賀 太陽, born 1998), Japanese football player
Takahiro Koga (古賀 貴大, born 1999), Japanese football player
Takeshi Koga (古賀 武, born 1939), retired Japanese judoka
Takuma Koga (古賀 琢磨, born 1969), Japanese former footballer
Takuma Koga (racing driver) (古賀 琢麻, born 19), Japanese stock car racing driver
Toru Koga (古賀 徹, born 1967), a Japanese mixed martial artist
Toshihiko Koga (古賀 稔彦, 1967-2021), a judo world champion
Toshinori Koga (古賀 俊憲, born 1948), Japanese boxer
Victor Koga (1935-2018), Japanese-Russian martial artist
Yukiko Koga, anthropologist
Yun Kōga (高河 ゆん, born 1965), Japanese manga artist
Yūsei Koga (古賀 悠聖, born 2001), Japanese shogi player