A group of friends who usually met at a grocery store called La Unión Italiana (located on the corner of Dorrego and 9 de Julio streets in Mar del Plata) decided to form a football team wearing as their uniform shirts in light blue and white.

That game produced a great enthusiasm on the group of youth players, who decided to found a club.

One of those players (then a radio broadcaster), Felipe Yódice, was the person who suggested the name of the club which was finally adopted.

Unión played in the Liga Marplatense de Fútbol (Mar del Plata Football League) since 1927, having won the championship in 1946 and 2006.

The last title allowed Unión to participate in the 2007 season of the Torneo del Interior (regionalized fifth division), where they lost the final.