Saihaku (西伯町 Saihaku-chō) was a town located in Saihaku District, Tottori, Japan.
On October 1, 2004 Saihaku was merged with the town of Aimi, also from Saihaku District, to form the new town of Nanbu.
As of 2003, the town had an estimated population of 8,147 and a density of 98.06 persons per km². The total area was 83.08 km².