Koriyama Castle was a Japanese castle located in Yamato-Koriyama City, Nara Prefecture. During the early to mid-period of the Toyotomi regime, it became the residence of Hashiba Hidenaga, Hideyoshi's half-brother (although some sources say he was his full brother), and was the center of his territory encompassing Yamato, Kii, and Izumi provinces. During the Edo period, it served as the administrative center of the Koriyama Domain.
郡山城（こおりやまじょう）は、奈良県大和郡山市にあった日本の城。豊臣政権の中初期には秀吉の異父弟（同父弟説もある）羽柴秀長の居城となり、その領国であった大和・紀伊・和泉の中心であった。江戸時代には郡山藩の藩庁が置かれた。