JUST B (저스트비) is a six-member boy group under Bluedot Entertainment, consisting of members Geonu, Bain, Lim Jimin, Siwoo, DY, and Sangwoo. They debuted on June 30, 2021, with their mini album Just Burn.

Some of the members previously participated in survival shows such as I-LAND and Under Nineteen.

Member Bain made headlines when he came out as part of the LGBTQIA+ community during the group’s concert in LA on April 22, 2025. As the first idol to take this step after debuting, he was widely praised for his courage and received a great deal of support.