Samarahan Division is one of the eleven administrative divisions in Sarawak, east Malaysia, on the island of Borneo. Formerly part of the First Division, which included Kuching, it became a separate Division on 24 July 1986. Samarahan Division has a total area of 4,967.4 square kilometers.
Samarahan Division contains four administrative districts: Samarahan, Asajaya, Serian and Simunjan. The total population is 246,782 (year 2010 census). The population is ethnically mixed, with mostly Bidayuh, Iban, Malay and Chinese predominating.