Saka, or Sakan, was a variety of Eastern Iranian languages, attested from the ancient Buddhist kingdoms of Khotan, Kashgar and Tumshuq in the Tarim Basin, in what is now southern Xinjiang, China. It is a Middle Iranian language. The two kingdoms differed in dialect, their speech known as Khotanese and Tumshuqese.
The Saka rulers of the western regions of the Indian subcontinent, such as the Indo-Scythians and Western Satraps, are traditionally assumed to have spoken practically the same language. This has however been questioned by more recent research.