Koga

Koga may refer to:

Japan

 * Koga, Ibaraki (古河)
 * Koga, Fukuoka (古賀)
 * Koga Domain

Elsewhere

 * Koga, a town in Tanzania
 * Koga (crater) on Mars

Other uses

 * Koga (surname)
 * Kōga-ryū, a school of ninjutsu
 * Koga clan, Japanese clan
 * KOGA (formerly Koga Miyata), bicycle brand from the Netherlands
 * Koga Cycling Team, a defunct Dutch cycling team

Fictional characters

 * Koga Gō, a character in the Bleach franchise
 * Koga, a Fuchsia City gym leader and Elite Four member in the Pokémon universe
 * Koga, a ninja dog clan in the manga and anime Ginga: Nagareboshi Gin
 * Koga, the name of the ninja clan that trained Firefly in the G.I. Joe universe
 * Koga, the leader of the eastern yōkai-wolf tribe in the Inuyasha series
 * Bajirisuku: Kōga Ninpō Chō (バジリスク〜甲賀忍法帖〜), the Japanese name for the manga Basilisk by Masaki Segawa
 * Koga Ōgami (鳴上嵐), a member of UNDEAD in the series Ensemble Stars!