Pagnacco () is a (municipality) in the Regional decentralization entity of Udine in the Italian region of Friuli-Venezia Giulia, located about northwest of Trieste and about northwest of Udine. As of 31 December 2004, it had a population of 4,824 and an area of .
The municipality of Pagnacco contains the (boroughs) Castellerio, Fontanabona, Lazzacco, Modoletto, Plaino, and Zampis.
Pagnacco borders the following municipalities: Colloredo di Monte Albano, Martignacco, Moruzzo, Tavagnacco, Tricesimo.
Pagnacco is twinned with: