Taihaku-ku is the southernmost ward of the city Sendai, in Miyagi Prefecture, Japan. As of 1 March 2023, the ward had a population of 234,391 and a population density of 1028 persons per km2 in 113,068 households. The total area of the ward was 228.39 square kilometres. Taihaku-ku is eleventh largest ward in Japan in terms of area, and second-largest in Sendai. The western portion of the ward is the former town of Akiu, Miyagi.