Bagnaria Arsa (Friulian: Bagnarie) is a comune (municipality) in the Regional decentralization entity of Udine in the Italian region of Friuli-Venezia Giulia, located about 50 kilometres (31 mi) northwest of Trieste and about 20 kilometres (12 mi) south of Udine.

The municipality of Bagnaria Arsa is formed by the frazioni (boroughs) Campolonghetto, Castions delle Mura, Privano, and Sevegliano, which houses the municipal seat.

Bagnaria Arsa borders the following municipalities: Aiello del Friuli, Cervignano del Friuli, Gonars, Palmanova, Torviscosa, Visco.