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. Its total revenue for the 2006 fiscal year was 260 million yen, of which sumo provided 80 million.
The Osaka Prefectural Gym is featured in the manga/anime series Fighting Spirit (Hajime no Ippo) as one of the venues the boxers fight at. It is also included in the video game adaptation of the series, Victorious Boxers.