Tell Tamer (Arabic: تَلّ تَمْر, romanized: Tall Tamr, Kurdish: گرێ خورما, romanized: Girê Xurma or Til Temir, Syriac: ܬܠ ܬܡܪ) also known as Tal Tamr or Tal Tamir, is a town in western al-Hasakah Governorate, northeastern Syria. It is the administrative center of the Tell Tamer Subdistrict consisting of 13 municipalities.

Originally built and inhabited by Assyrians of the Upper Tyari tribe in the late 1930s, the town is predominantly populated by Arabs, with Assyrians remaining a substantial minority of about 20%. At the 2004 census, Tell Tamer had a population of 7,285.

Located on the Khabur River at an intersection between the M4 Highway (Aleppo–Mosul) and the major road between al-Hasakah and Diyarbakır (Turkey), the town is a transport hub of major importance.

The name of the town, "Tell Tamer", is derived from the Arabic and Aramaic words "tell/tella", both meaning "hill", and "tamer/tamra", both meaning "date". The name of the town therefore means "Hill of Dates".

In the Khabur Valley of Upper Mesopotamia, Tell Tamer is situated on the left (eastern) bank of Khabur River, just south of the small Zirgan River's estuary. About 3 kilometres (1.9 mi) to the east, the landscape ascends to the Ard al-Shaykh volcanic basalt plateau.

Tell Tamer lies on a direct line between the city of Ras al-Ayn some 35 kilometres (22 mi) to the northwest and the provincial capital al-Hasakah some 40 kilometres (25 mi) to the southeast. The intersection with the M4 highway (Aleppo–Mosul) and the nearby river crossing make Tell Tamer an essential transport hub.

It was settled in the 1930s by Iraqi Assyrian refugees fleeing the Simele massacre in Iraq, who moved to French controlled Syria and settled in a 25 km stretch of the Khabur River in 35 settlements.

An Assyrian exodus from the town began in November 2012, when Free Syrian Army soldiers threatened to invade the town. The exodus further continued when the Islamic State took control of nearby roads just outside the town.