The Sakay River is a waterway in Bongolava, Madagascar, and passes through the towns of Ankadinondry Sakay and Mahasolo.

It has its sources East of Tsiroanomandidy in a plaine at 1400m altitude and its mouth is in the Mahajilo River.

An affluent is the Lily River that has its sources in the Kavitaha Lake in Ampefy (Itasy).