Ōtawara Castle (大田原城 Ōtawara -jō) is a Japanese castle located in Ōtawara, southern Tochigi Prefecture, Japan. Throughout the Edo period, Ōtawara Castle was home to a branch of the Ōtawara clan, daimyō of Ōtawara Domain. It was also called the "Dragon Castle" (龍城 Ryū-jō?)