Osaka Tōin Junior and Senior High School (Japanese: 大阪桐蔭中学校・高等学校, Hepburn: Ōsaka Tōin Chūgakkō, Kōtōgakkō) is a private co-educational junior and senior high school located in Daitō City, Osaka Prefecture, Japan.

[5] In 1991, only the club's fourth year of existence, Osaka Tōin participated in the spring invitational tournament for the first time.

[6] Wada and future Yomiuri Giants member Yoshihiro Seo pitched in the championship match against Okinawa Fisheries ace Rin Ōno; fellow future Yomiuri Giant Makoto Hagiwara hit the only home run of the match.

[10] Future Hanshin Tigers ace Shintaro Fujinami was the star of the tournament, pitching shutouts in both the semi-final and final.

[10] In the autumn of 2012, Osaka Tōin was joint-champion of the National Sports Festival along with Sendai Ikuei,[11] becoming the third school in history to win the "triple crown" in one year.

It has qualified for the national championships several times since its first appearance in 2007; in 2011 the club finished runners-up, losing to Tokiwagi Gakuen High School LSC 1–3 in the final.

In 2013 the club won the 14th Spring Invitational Tournament, its first championship win at the national level, defeating Tokai University Gyosei High School 33-14 in the final.

In November 2013 the club won the Osaka Prefecture ekiden qualification race and finished 22nd in the national championship in the following month.