Say (Saayi) is a town in southwest Niger, situated on the Niger River. It is the capital of the Say Department in the Tillabéri Region. Say was a small Songhai town prior to the arrival of the Fulani marabout Alfa Mohamed Diobo in the nineteenth century who converted the town to a center for Islamic learning and established the Emirate of Say. The municipality has 58,290 inhabitants, and its economy is dominated by agriculture, herding and small trade. Today, the inhabitants of Say are mostly Peulh, Songhai and Zarma.

Tillabéri is one of the seven Regions of Niger; the capital of the Region is Tillabéri. Tillabéri Region was created in 1992, when Niamey Region was split, with Niamey and its immediate hinterland becoming a new capital district enclaved within Tillabéri Region.