Seiya Tsutsumi (堤聖也, born December 24, 1995) is a Japanese professional boxer who has held the WBA bantamweight title since October 2024.

[4] On January 28, 2020, Tsutsumi faced Kazuki Nakajima, ranked 6th in the Japanese bantamweight division, in the tournament final.

On March 31, 2023, it was announced that Tsutsumi would be seeded in the first round and participate in the semi-finals of the Ohashi Boxing Gym's Monster Tournament.

[14] Tsutsumi challenged Takuma Inoue for his WBA bantamweight title at Ariake Arena in Tokyo, Japan on October 13, 2024.

[16] Tsutsumi is scheduled to make the first defense of his WBA bantamweight title against Daigo Higa at Ariake Arena in Tokyo, Japan on February 24, 2025.