Matsudo Castle, Japanese castle in Matsudo, Japan

Matsudo Castle is a Sengoku-period hirayama-style castle site on a 20–25 m plateau in Matsudo, Chiba Prefecture. Earthworks remain: baileys, dry moats and parts of earthen ramparts, though they are hard to make out. The northern part is now Todakigaoka Historical Park around the former Mito Tokugawa family villa Todai-tei; the southern part belongs to Chiba University's horticulture faculty.

Matsudo Castle was a Sengoku-period hirayama castle in Shimōsa Province, held in the 15th and 16th centuries by the Hara and Takagi clans. In the Chōroku and Kansei years Hara Shinano Nyūdō and his son Hara Hachirō, retainers of the Chiba clan, occupied Matsuwata Castle on the orders of shogun Ashikaga Yoshimasa. In 1538, before the first Battle of Kōnodai, the Later Hōjō army left Edo Castle on the night of 6 October and reached Matsudo Castle on the morning of 7 October.

The castle's name also appears as Matsuwatari-jō (松渡城). In the 15th and 16th centuries it was held by the Hara and Takagi clans; Hara Shinano Nyūdō and his son Hara Hachirō entered the castle on the orders of shogun Ashikaga Yoshimasa. In 1538 the Later Hōjō army left Edo Castle on the night of 6 October and reached Matsudo Castle the next morning.

The site sits on a 20–25 m plateau; its northern part is now Todakigaoka Historical Park, centred on the former Mito Tokugawa family villa Todai-tei and the Todai History Museum, while the southern part belongs to Chiba University's Faculty of Horticulture. Remains of baileys, dry moats and earthen ramparts can be made out only faintly. The castle area was bounded by a valley running south-east between the plateau and the university farm.

The castle's earthworks survive only faintly: a few kuruwa enclosures, dry moats and earthen ramparts on a 20–25 m plateau, most of them hard to make out. The northern part of the site now holds the Todei residence, a former Mito Tokugawa family villa, and the Todei History Museum within Todei-ga-oka Historical Park; the southern part belongs to Chiba University's horticulture faculty.