Saihaku (西伯郡, Saihaku-gun) is a district located in Tottori Prefecture, Japan.

As of 2003, the district has an estimated population of 50,436 and a density of 135.28 persons per km. The total area is 372.83 km.

Towns and villages

• Daisen
• Hiezu
• Hōki
• Nanbu

Mergers

• On October 1, 2004 the towns of Saihaku and Aimi merged to form the new town of Nanbu.
• On January 1, 2005 the town of Kishimoto merged with the town of Mizokuchi from Hino District to form the new town of Hōki in Saihaku District.
• On March 28, 2005 the towns of Nakayama and Nawa merged into the town of Daisen.
• On March 31, 2005 the town of Yodoe merged into the city of Yonago.