Sekiyado Castle (Sekiyado-jō) is a Japanese castle located in Noda, northwestern Chiba Prefecture, Japan. At the end of the Edo period, Sekiyado Castle was home to the Kuse clan, daimyō of Sekiyado Domain. Sekiyado is located at the confluence of the Tone River and the Edogawa River, and was thus a strategic location controlling river traffic in the northern Kantō region, as well as the northeastern approaches to Edo.
A fortification was built on this location in the early Muromachi period by either Yadoya Mitsusuke (1395-1438) or Yadoya Shigesuke (d. 1512). It was destroyed during a campaign by the Late Hōjō clan of Odawara to conquer the Kantō region from 1565-1574. After the Hōjō clan was destroyed in the Battle of Odawara, they were supplanted by Tokugawa Ieyasu, the castle was reconstructed by Matsudaira Yasumoto in 1590.