M-Wave (Japaneseエム ウェーブ, Emu Webu ) is a multi-purpose hall in Nagano, Japan.
The hall was built in 1996 and can accommodate 10,000 spectators. M-Wave in 1998 was the venue for the speed skating competitions of the 1998 Winter Olympics, the opening and closing ceremony of the Paralympic Games in 1998 and the Single Distances Speed Skating World Cup in 2008. 230 m × 160 m large hall with two movable stands. This allows the size of the inner surface can be varied. A -roll- artificial turf allowing the use of the hall for American football games.