Sason ( "Sasun"; from ; formerly known as Sasun or Sassoun) is a district in the Batman Province of Turkey. It was formerly part of the sanjak of Siirt, which was in Diyarbakır vilayet until 1880. It was in Bitlis Vilayet in 1892. Later it became part of Muş sanjak in Bitlis vilayet. Sason remained part of Muş until 1927. It was one of the districts of Siirt province until 1993. The boundaries of the district varied considerably in time. The current borders are not the same as in the 19th century. This is when the district of Sasun was situated more to the north (mostly territory now included in the central district of Muş).