The Big Hat (ビッグハット, Biggu Hatto) is an indoor ice hockey arena in Nagano, Japan with a capacity of 10,104 seated spectators.

Nagano Olympic Stadium, where the opening and closing ceremonies were held, is 8 km south of Big Hat.

The ice hockey games from the 1998 Winter Olympics, including the men's and women's finals, were held at this arena.

It was an ice hockey tournament held to commemorate the 1998 games, as well as many short track speed skating competitions.

The Wakasato hall in the complex features a stage and theater seating, and frequently serves as a venue for music recitals and public meetings.