Nasunogahara Harmony Hall, Music venue in Otawara, Japan

Nasunogahara Harmony Hall is a concert complex in Otawara, Tochigi Prefecture, near the Nasushiobara city boundary. It holds a 1,200-seat main hall, a 400-seat small hall whose exterior is spherical, and a 130-person multipurpose hall, plus two galleries of about 533 and 250 square metres. The main hall's organ, installed in 2013, is 9.3 m tall and 11.1 m wide.

Nasunogahara Harmony Hall opened in 1994 as Japan's first cultural hall jointly built by two municipalities, Otawara and the former Nishinasuno town, now Nasushiobara. The site straddles their border, mostly in Otawara with the western part in Nishinasuno. A pipe organ fund began at opening, and the French symphonic instrument was completed in 2013.

The hall hosts not only concerts but also rakugo performances, lectures, plays, school events of local middle and high schools, weddings and exhibitions. It was selected for Japan's 100 Best Halls list. A friends' association offers ticket discounts and mailed flyers to members.

The hall stands near the boundary of Otawara and Nasushiobara, with most of the site in Otawara and the western part in the former Nishinasuno town. It holds a large hall, a small hall and a 130-person multipurpose room, plus two galleries of about 533 and 250 square metres. During main-hall performances, children can be left at the on-site childcare room.

The hall was the first cultural facility in Japan jointly built and run by two municipalities, Otawara and the former Nishinasuno town, now Nasushiobara. It stands near their border: most of the site lies in Otawara, while its western part belongs to Nasushiobara.