Real Unión Club de Irún, 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 in 1915 it currently plays in Segunda División B, holding home matches at the 5,000-seater Stadium Gal.

Real union is a union of two or more states, which share some state institutions as in contrast to personal unions; however they are not as unified as states in a political union. It is a development from personal union and was usually limited to monarchies.