Itasy is a region in central Madagascar. It borders Analamanga region in northeast, Vakinankaratra in south and Bongolava in northwest. The capital of the region is Miarinarivo, and the population was 897,962 in 2018. It is the smallest of all the 22 regions in area with 6,993 km2 (2,700 sq mi), and is the most densely populated region after Analamanga.

Arivonimamo is a district of Itasy in Madagascar.