Osaka Prefectural Gymnasium (大阪府立体育会館, Ōsaka furitsu taiikukaikan) is an indoor sporting arena located in Namba, Osaka, Japan. It first opened in 1952 and the current building was constructed in 1987. It is the venue of a professional sumo tournament (honbasho) held in March every year. The capacity of the arena is 8,000 people.