JO1 is a Japanese boy band formed through the first season of Produce 101 Japan by Lapone Entertainment. The band is composed of nine members: Issei Mamehara, Ren Kawashiri, Takumi Kawanishi, Ruki Shiroiwa, Keigo Sato, Syoya Kimata, Junki Kono, Sukai Kinjo, and Sho Yonashiro. Originally formed as an eleven-member group, Shion Tsurubo and Shosei Ohira left the band in 2025 and 2026, respectively. The group is the first permanent Produce 101 winning group.