|Full name||Unión Sporting Club|
|Ground||Campo da Florida, Vigo,|
Unión SC was founded in 1922, from a merge of Comercial Football Club and Victoria Sport Club. In the 1933–34 season, the club won the Tercera División, and disputed one campaign in Segunda División, finishing last in its group.
In 1937, Unión SC was disbanded, mainly due to World War II. The club did not return to an active status, but the club's board and players joined Football Club Vigués in 1939, acting mainly as Celta de Vigo's reserve team.
|Season||Division||Place||Copa del Rey|