Liella! is an idol group created in the multimedia franchise "Love Live!". Specifically, it is associated with the "Love Live! Superstar!!" project, the fourth major installment in the series.

There are eleven members:

Kanon Shibuya (CV. Sayuri Date)
Keke Tang (CV. Liyuu)
Chisato Arashi (CV. Nako Misaki)
Sumire Heanna (CV. Naomi Payton)
Ren Hazuki (CV. Nagisa Aoyama)
Kinako Sakurakoji (CV. Nozomi Suzuhara)
Mei Yoneme (CV. Akane Yabushima)
Shiki Wakana (CV. Wakana Okuma)
Natsumi Onitsuka (CV. Aya Emori)
Wien Margarete (CV. Yuina)
Tomari Onitsuka (CV. Sakura Sakakura)

In January 2020, Love Live! staff announced that a new project was being developed. This was revealed to be "Love Live! Superstar!!" in July, and the name of the protagonist unit "Liella!" was chosen by fan vote in September.

The original quintet of members - Kanon, Keke, Chisato, Sumire, & Ren - and their voice actors were announced on December 14, 2020. Following the first season of the anime, it was announced that four more members were to be added, with the cast for Kinako, Mei, Shiki, and Natsumi being revealed on May 12, 2022.

In the second season of the anime, Wien was introduced as an antagonist, and the casting of Yuina was revealed in tandem with the broadcast of the second episode. A solo single "Butterfly Wing/Edelstein" was released on November 30, 2022. After the second season, it was announced that Wien and a new member, Tomari, would be joining the group. The final voice actor was announced, and Wien's was re-introduced, on June 11, 2023.

Also announced on June 11, 2023, was the fan-voted names of the three Liella! subunits:

CatChu! (Kanon, Sumire, & Mei)
KALEIDOSCORE (Keke, Ren, & Wien)
5yncri5e! (Chisato, Kinako, Shiki, Natsumi, & Tomari)

The characters were designed by Yuhei Murota, later adapted by Atsushi Saito.