Tatsuya Katō (born July 28 1980) is a Japanese composer. Katō's noteworthy credits include: Future Diary,
Demon King Daimao, Fate/kaleid liner Prisma Illya, Buddy Complex, Free! - Iwatobi Swim Club, The Qwaser of Stigmata, Kämpfer, and Day Break Illusion. He has composed the music for the anime television series Gonzo Gang Mater.