Asama Onsen (浅間温泉) is an onsen located in the city of Matsumoto, Nagano Prefecture, Japan.
The Asama Hot Spring Center, also known as the Hot Plaza Hall, has a configuration typical of many Japanese onsen with separate areas for males and females; each area contains multiple indoor pools and two outdoor pools, one hot and one cold. The published temperature range of this onsen is 42-47 degrees Celsius.