| Aichi Prefectural Gymnasium | |
| Logo Image: | File:Dolphins Arena logo.jpg |
| Fullname: | Aichi Prefectural Gymnasium |
| Location: | Naka-ku, Nagoya, Aichi |
| Opened: | 1964 |
| Owner: | Aichi Prefecture |
| Operator: | Aichi Prefecture |
| Capacity: | 7,515 |
| Scoreboard: | Diamond Vision LED centerhung scoreboard[1] |
| Architect: | Katsumi Nakayama |
| Main Contractors: | Toda Corporation |
| Tenants: | Nagoya Diamond Dolphins Mitsubishi Electric Koalas |
| Website: | http://www.aichi-kentai.com/ |
, also known as, is a multi-purpose gymnasium in Nagoya, Japan, built in 1964.
Located on the site of the secondary enclosure of Nagoya Castle, it is host to numerous concerts and events. The gymnasium has 4,375 fixed seats and can accommodate an additional 3,032 on the floor for certain events, giving it a total maximum capacity of 7,407.[2]
It won the 7th annual Building Contractors Society Award in 1966.[3]
Professional Sumo's July Grand Sumo Tournament was held at the site every year from the second until the fourth Sunday in July. Beginning in 2025, the tournament will move to the nearby (IG Arena), owned and operated by Anschutz Entertainment Group.[4]
It is the home arena of the Nagoya Diamond Dolphins of the B.League. Dolphins acquired its naming rights (JPY 25 million, three years) in 2018.