An all-girl band in the BanG Dream! franchise. The group consists of five members:

• Vocals: Aina Aiba as Yukina Minato
• Guitar: Haruka Kudo as Sayo Hikawa
• Drums: Megu Sakuragawa as Ako Udagawa
• Keyboard: Kanon Shizaki as Rinko Shirokane
• Bass: Yuki Nakashima as Lisa Imai

Yurika Endou was the previous bassist and voice actor for Lisa up until May 2018, when she retired from the entertainment industry and was replaced with Nakashima.
Satomi Akesaka was the previous keyboardist and Rinko's VA until September 2018, when she was forced to step down after suffering sudden deafness twice, and was replaced with Shizaki.

Roselia's band name was coined from combining the words Rose and Camellia. They debuted with the song "BLACK SHOUT".