塞斯陶（西班牙语：Sestao），是西班牙巴斯克自治区比斯开省的一个市镇。总面积4平方公里，总人口31773人（2001年），人口密度7943人/平方公里。

Sestao is a town and municipality of 28,288 inhabitants located in the province of Biscay, in the autonomous community of Basque Country, northern Spain. It is in the left bank of the Estuary of Bilbao and part of Bilbao's metropolitan area.

Sestao was the place of the most important steel industry of Biscay, Altos Hornos de Vizcaya.