Tatsuhiko Saiki (斎木 達彦, Saiki Tatsuhiko, October 5, 1995) is a Japanese composer and arranger born in Kanagawa Prefecture.

He graduated from the Liverpool Institute of Performing Arts. He moved to England at the age of 18 and began making video game songs and music while attending college. He is primarily engaged in composing music videos and providing music for vocal work. Grass skiing representative for Japan.