Real Sociedad de Fútbol B (also known as Sanse) is a Spanish football team based in San Sebastián, in the autonomous community of Basque Country. Founded in 1951, it is the reserve team of Real Sociedad and plays in Segunda División B, holding home games at "Campo José Luis Orbegozo" of the Zubieta Facilities.
The team participates in UEFA.
As they are in the second division, and a reserves team, it is not possible for them to be part of the UEFA cup championships.