Drenchia (; ) is a (municipality) in the Regional decentralization entity of Udine in the Italian region of Friuli-Venezia Giulia, located about north of Trieste and about northeast of Udine, on the border with Slovenia. Drenchia is located on the western slopes of the Kolovrat Range, dividing Italy from Slovenia, and borders the following municipalities: Grimacco, Kanal ob SoÃÂi (Slovenia), Kobarid (Slovenia), and Tolmin (Slovenia).
Drenchia localities include Clabuzzaro/Brieg, Crai/Kraj, Cras/Kras, Drenchia inferiore/Dolenja Dreka, Drenchia Superiore/Gorenja Dreka, Lase/Laze, Malinsche/Malinske, Obenetto/Dubenije, Obranche/Obranke, Oznebrida/Ocnebardo, Paciuch/PaÃÂuh, Peternel/Peternel, Prapotnizza/Praponca, San Volfango/Svet à  tuoblank, Trinco/Trinko, Trusgne/Truà ¡nje, Zavart/Zavart, Zuodar/Cuoder. The municipal hall is located in Cras.
As of 31 December 2010, it had a population of 141 and an area of .
97% of the population in Drenchia were Slovenes according to the census 1971.