Niji no Conquistador (虹のコンキスタドール) is a Japanese idol group formed on July 14, 2014, originally managed by the illustration website Pixiv as a part of the Tsukudol! Project (つくドル！プロジェクト) before later moving to DEARSTAGE.

The theme of Rainbow Conquistador is "Everyday Is a Culture Festival!" and is considered to be an indoor and orthodox idol who pursues their own ideas of "Cute!" and "Nice". The name comes from the aim of becoming a conqueror of fans' hearts with the colors of the rainbow.

They had a spin-off group called Beboga!, which was previously Nijicon's Yellow Team.

They also had a sister group called Niji no Fantasista, which disbanded in March 2021.