Nakasen (中仙町, Nakasen-machi) was a town located in Senboku District, Akita Prefecture, Japan.
In 2003, the town had an estimated population of 11,486 and a density of 145.54 persons per km2. The total area was 78.92 km2.
On March 22, 2005, Nakasen, along with the city of Ōmagari; the towns of Kamioka, Kyōwa, Nishisenboku, Ōta and Semboku; and the village of Nangai (all from Senboku District), merged to create the city of Daisen.[1]
The town's annual festival, the Don Pan Matsuri, is held each summer and features a communal dance. The municipal clock plays the tune associated with the festival several times daily.
大仙市は、2005（平成17）年3月22日に大曲市、神岡町、西仙北町、中仙町、協和町、南外村、仙北町、太田町の1市6町1村が合併し誕生しました。