Real Unión Club, S.A.D. is a Spanish football club based in Irun, in the autonomous community of the Basque Country, in the province of Gipuzkoa, near the border with France. Founded on 15 May 1915 it currently plays in Primera División RFEF – Group 2, holding home matches at the 5,000-seater Stadium Gal. Real Unión was one of the founding members of La Liga in 1929. The club spent four seasons in the Spanish elite, suffering relegation in 1932. Real is yet to return to the top tier, spending the rest of its history bouncing between the second and fourth tiers of Spanish football.

Irun is a town of the Bidasoaldea region in the province of Gipuzkoa in the Basque Autonomous Community, Spain.