Koga may refer to:
Places
Japan
- Koga, Ibaraki (古河)
- Koga, Fukuoka (古賀)
- Koga Domain (古河藩)
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
- , the Japanese name for the manga Basilisk by Masaki Segawa
- , a member of UNDEAD in the series Ensemble Stars!
See also
- Koka (disambiguation)
- Kouga (disambiguation)
- KOGA (disambiguation)