水曜日のカンパネラ (Suiyoubi no Campanella; English: Wednesday Campanella) are an electronic project from Tokyo, Japan. Active since 2012, Suiyoubi no Campanella was composed of singer/songwriter/personality KOMI and producer/composer Kenmochi Hidefumi. In September 2021, KOMI was replaced by vocalist Utaha, with producer/composert Kenmochi Hidefumi staying and continuing his original vision.

Suiyoubi no Campanella's sound is difficult to describe in that it varies greatly. KOM_I's lyrics and raps often reference pop culture or quirky historical figures, which she performs solo in live performances. Kenmochi's production spans drum n bass to breakbeat, IDM to lounge, progressive house to dance-pop—often in the same song.

The band's name, "Wednesday's Little Bell" is a reference to their initial group meetings, which often took place on Wednesdays. They frequently perform in small venues and used to only distribute their music at said performances. Suiyoubi no Campanella is also very active on YouTube, creating music videos for nearly all of their album's singles.