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is a city located in Akita Prefecture, Japan. As of 2011, it has an estimated population of 87,497 and an area of 866.68 km², giving a population density of 101 per square kilometer.
The city was created on March 22, 2005 from the merger of the city of Ōmagari, the towns of Kamioka, Nishisenboku, Nakasen, Kyōwa, Semboku, Ōta, and the village of Nangai, all from Semboku District.
After the merger, Daisen has the distinction of having the largest city assembly in all of Japan, 136 members , far exceeding even Tokyo Metropolis, due to the retention of all of the former municipalities' assembly members, though some have resigned.