Tell Tamer Subdistrict () is a subdistrict of al-Hasakah District in western al-Hasakah Governorate, northeastern Syria. The administrative centre is the city of Tell Tamer.
At the 2004 census, the subdistrict had a population of 50,982. Assyrians from the Assyrian Church of the East constitute about 40% of the population of this district, with the rest being Kurds and Arabs. It is the headquarter of the Assyrian Khabour Guards and Nattoreh militias, as well as the location of a large Syriac Orthodox Monastery.