San Tirso Sociedad Deportiva is a Spanish football club based in Mabegondo [es], Abegondo, in the autonomous community of Galicia.

Founded in 1940, they currently play in Preferente Futgal – Group 1, holding home matches at the Campo Municipal do Monte.

San Tirso also have a 20-year affiliation agreement with Deportivo de La Coruña since 2017, with the Cadete B and Infantil B players of Dépor being assigned to San Tirso.

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