Idrija (Italian: Idria, German: Idria) is a small Slovenian town that is the administrative centre of the Municipality of Idrija (Slovene: Občina Idrija). It is known for its mercury mine and the production of lace.
The municipality of Idrija was established on 10 March 1994. In 2011, Idrija was given the Alpine Town of the Year award.