Kōtarō Isaka
writer,actor
- Gender: Male
- Birthday: 1971-05-25 ( 53 years old )
- Place of Birth: Matsudo, Chiba, Japan
- Also Known As: Kôtarô Isaka / 伊坂 幸太郎 / Kotaro Isaka
- IMDB:nm2157655
Kōtarō Isaka (伊坂 幸太郎, Isaka Kōtarō, born 25 May 1971) is a Japanese author of mystery fiction.