"Aiin Taisō/Aiin! Dance no Uta" (アイ〜ン体操/アイ〜ン!ダンスの唄) is the fifth single of the Hello! Project subgroup Minimoni. It was released on April 24, 2002 and sold 212,230 copies.
This single was a collaboration with comedian Ken Shimura in his Baka Tono-sama persona, and was jointly credited to Baka Tono-sama to Minimoni Hime (バカ殿様とミニモニ。姫). A double A-side, its title tracks were both built around the interjection "Aiin!", which Shimura had already established as a catch phrase.