Concordia Sagittaria is a comune in the Metropolitan City of Venice, Veneto, Italy.
The town was founded in 42 BC as Iulia Concordia by the Romans, where the Via Annia and the Via Postumia crossed each other. The establishment of the Diocese of Concordia dates from . The city was taken and destroyed by Attila in 452 AD.
After the fall of the Western Roman Empire, it was part of the Lombard duchy of Cividale, and later became part first of the March of Friuli and then the Patriarchate of Aquileia.
In 1420, together with all Friuli, it was annexed by the Republic of Venice.
In 1838, it was separated from Friuli to be included in the province of Venice.