Tsiroanomandidy [tsiˌronʷmanˈdidʲ] is a city (commune urbaine) in central-western Madagascar, approximately 210 kilometres west of the capital Antananarivo.
Tsiroanomandidy is the capital of Bongolava Region and of Tsiroanomandidy District. Its name means One person only reigns and comes from the souvenirs of the victory of king Radama I over his rival Ramitraho, King of the Sakalava in 1822.