Daisen (大山町 Daisen-chō) is a town located in Saihaku District, Tottori Prefecture, West Japan.
As of June 1st, 2016, Daisen had an estimated population of 10,420 and a population density of 54.9 persons per km². The total area is 73.28 square miles (189.79 km2). The town is known for Mount Daisen, the tallest mountain in the Chūgoku Region. The mountain was an early center of Shinto and Buddhist practice, and the town has numerous designated Cultural Properties of Japan.
The town of Daisen was formed from the merger of the towns of Nakayama and Nawa, both from Saihaku District, on March 28th, 2005.
Daisen is located to the west of Saihaku District. The north of the town has a broad coast along the Japan Sea, and its inland area sweeps up to the Chūgoku Region, specifically Mount Daisen. The Amida River flows north towards the Sea of Japan and forms an alluvial delta in Daisen.