Ligosullo is a frazione of Treppo Ligosullo in the Province of Udine in the Italian region Friuli-Venezia Giulia, located about 110 kilometres (68 mi) northwest of Trieste and about 50 kilometres (31 mi) north of Udine. It was a separate comune until February 1 2018, when it was merged with Treppo Carnico, which created the Treppo Ligosullo comune.