Katsuyuki Sumisawa (隅沢 克之; born on November 8, 1961) is a Japanese screenwriter focusing on anime scenario.
Katsuyuki Sumisawa entered Takao Koyama's school in 1987. He wrote screenplay for Dragon Ball, Dragon Ball Z, and Dragon Ball Z Kai, as well as the TV special Dragon Ball Z: Bardock - The Father of Goku.
Outside of the Dragon Ball franchise, Sumisawa worked on Bakusou Kyoudai Let's & Go, Blue Dragon, Chō Seimeitai Transformers: Beast Wars Neo, Clamp School, (The) Daichis - Earth Defence Family, Girl From Phantasia, Happy Lucky Bikkuriman, InuYasha, Kaze no Yojimbo, Lord of Lords Ryu Knight, Miami Guns, Mobile Suit Gundam Wing, Naruto, Rave Master, Sailor Moon, Saiyuki Reload: Burial, Tokyo Underground, Yakitate!! Japan, You're Under Arrest, Yu Yu Hakusho: Ghost Files, and Zoids/ZERO.