JO1 (ジェイオーワン, Jeiōwan) is a Japanese boy band formed through the reality competition show Produce 101 Japan. The group consists of eleven members: Issei Mamehara, Ren Kawashiri, Takumi Kawanishi, Shosei Ohira, Shion Tsurubo, Ruki Shiroiwa, Keigo Sato, Syoya Kimata, Junki Kono, Sukai Kinjo, and Sho Yonashiro. Unlike other Produce 101 winning groups, JO1 is intended to be a permanent group. It is managed by Lapone Entertainment, a joint company between Yoshimoto Kogyo and CJ ENM.
Debuting with single Protostar on March 4, 2020, the group's commercial success has led to them earning several new artist awards during its first year including Best New Asian Artist at the 2020 Mnet Asian Music Awards and Best 5 New Artists at the 2021 Japan Gold Disc Award. JO1 has sold more than 1.1 million physical copies in Japan.