Drenchia (Slovene: Dreka; Friulian: Drencje) is a village and comune (municipality) in the Regional decentralization entity of Udine in the autonomous region of Friuli-Venezia Giulia in Italy, located about 60 kilometres (37 mi) north of Trieste and about 35 kilometres (22 mi) northeast of Udine, on the border with Slovenia. It has 88 inhabitants.

Drenchia is located on the western slopes of the Kolovrat Range, dividing Italy from Slovenia, and borders the following municipalities: Grimacco, Kanal ob Soči (Slovenia), Kobarid (Slovenia), and Tolmin (Slovenia).

As of 2026, the population is 88, of which 53.4% are male, and 46.6% are female. Minors make up 3.4% of the population, and seniors make up 52.3%.

97% of the population in Drenchia were Slovenes according to the 1971 census.

As of 2025, immigrants make up 15.7% of the total population. The 3 largest foreign countries of birth are France, Romania, and Serbia.