Yefren is a Berber town of northwestern Libya in the Nafusa Mountains, ninety kilometres south of Tripoli. The Berber name Ifren — "the caves" — derives from the same root as the medieval Banu Ifran dynasty and the broader cave-named toponymy of the Maghreb; the local pronunciation softens the initial consonant to Yefren in everyday speech.
The town is one of the principal centres of the Nafusa Berber-speaking sphere, alongside Jadu and Nalut to the west. Its population speaks Tanfusit (Nafusi), an eastern Berber variety classified within the Zenati branch and shared in continuous form with the surrounding mountain villages. The community is historically Ibadi Muslim, in close cultural and theological connection with the Mozabite Ibadi communities of the Algerian M'zab and the Djerbi Berbers of southern Tunisia.
The 2011 Libyan uprising opened the Nafusa front of the war. Yefren was a centre of anti-Gaddafi mobilisation from late February 2011 and was held by Berber militias against successive regime offensives through the spring and early summer; the eventual breakthrough of the Nafusa front in mid-July 2011 was the decisive military development of the western Libyan theatre and led directly to the fall of Tripoli in August.
The post-Gaddafi period has produced an unprecedented public assertion of Berber identity in Libya — the use of Tifinagh on local signage, the development of Tanfusit-language radio and broadcast media, the formation of the Amazigh Supreme Council and other community institutions. Constitutional and political recognition of Berber as a Libyan national language remains a continuing demand and has not yet been formalised in the post-2011 transitional arrangements.