Sekiyado (関宿町, Sekiyado-machi) was a town located in Higashikatsushika District, Chiba Prefecture, Japan.

However, it expanded on July 20, 1955 by annexing the neighboring villages of Futagawa and Kimagase.

Some minor border adjustments were made with the neighboring city of Noda in 1961 and 1999.

On June 6, 2003, Sekiyado was merged into the expanded city of Noda and ceased to exist as an independent municipality.

As of June 1, 2003, (the last data from before the merger), Sekiyado had an estimated population of 30,710 and a density of 1295 persons per km2.