Tejen (older spellings: Tedzhen, Tejend, Tejent) is an oasis city in the Karakum Desert, in Ahal Province of Turkmenistan.

It lies along the M37 highway, between Dushak and Mary, 223 kilometres (139 mi) by road southeast of Ashgabat.

Atanyyazov explained, ...The meaning of this ancient name is not clear...Barthold noted that this name was also used in the form of Tuzhen in the X-XI centuries...Vambery derived it from the words tei-e hend (tei-e kent, tei— “down”, kent - “village”, “city”) and derived from that “downstream of the city,” “downstream of the city,” or “downstream of the river".

In 1916, when the Turkmens participated in a revolt against the Russians, Tejen was a hotbed of activity.

[12] It is a stop on the Trans-Caspian railway, and in the 1996 a new rail line via Sarahs to Mashhad in Iran was opened.