Tateyama Castle (舘山城, Tateyama-jō) was a Sengoku period Japanese castle located in what is now the city of Yonezawa, southern Yamagata Prefecture, Japan. The site of the castle was designated a National Historic Site in 2016. The castle grounds are a 20 minutes walk from Nishi-Yonezawa Station on the JR East Yonesaka Line. It should not be confused with Tateyama Castle in Tateyama, Chiba, whose name is written with slightly different kanji.