Futamata Castle (二俣城, Futamata-jō) was a Japanese castle located in Toyoda county of Tōtōmi Province, in what is now part of Tenryū-ku in the city of Hamamatsu, Shizuoka Prefecture, Japan. It was built in the Sengoku period and is noted as the site of the death of Tokugawa Ieyasu's son Matsudaira Nobuyasu in 1579. In 2018, the ruins were recognized as a National Historic Site together with adjacent Tobayama Castle (鳥羽山城, Tobayama-jō).