Koyadaira (木屋平村 Koyadaira-son) was a village located in Mima District, Tokushima, Japan.
On March 1, 2005 Koyadaira was merged with the towns of Mima (old), Anabuki, and Waki, all from Mima District, to form the new city of Mima.
As of 2003, the village had an estimated population of 1,210 and a density of 11.98 persons per km². The total area was 100.97 km².