Sumashi (スマシ, Sumashi) was a tokubetsu jōnin of Iwagakure.
He and his group attacked Team Minato during the Third Great Shinobi War after they broke into Iwagakure territory. Congratulating the young shinobi for achieving this feat, he then attacked Kakashi after Kakashi and his teammate, Rin Nohara had managed to escape the landscape that had killed their team member, Obito Uchiha. Sumashi was however presumably killed after Minato Namikaze teleported to his team's side after being alerted that the kunai he gave Kakashi was thrown.
Sumashi had a short crop of black hair, small dark eyes and thick eyebrows. He wore the standard attire of the Iwagakure shinobi complete with a forehead protectorwhich he wore like a bandanna, flak jacket, and the single left-sleeved shirt with a lapel running down the right side of his waist and sandals. 
Though little was known of his skills, he was proficient with Earth Release techniques witnessed by his use of the Earth Release: Tearing Earth Turning Palm in an attempt to bury the members of Team Minato alive.
- Sumashi is the only introduced tokubetsu jōnin in the series who is not from Konohagakure.