Real Sociedad B

The team's origin dates from 1952 when the Real Sociedad youth team were runners-up in the Copa del Rey Juvenil and the club's board sought to bridge the gap between the talented teenagers and the senior team: the concept of Real Sociedad de Fútbol Junior was introduced, but economic problems delayed its first official match until 1955, immediately after the youth team won the Copa Juvenil.^[1] After quickly gaining promotion to the third tier to become part of the national football pyramid, a name change was required to differentiate them from the senior team, and San Sebastián Club de Fútbol was chosen.^[1] They first reached the second division in 1959–60, and achieved a best ever classification in the category after finishing fifth two years later; however, as the main squad was relegated from La Liga, San Sebastián was ineligible for promotion, being relegated instead.^[1]

In 1980, Sanse was promoted to the newly created Segunda División B, remaining in that category for 17 consecutive seasons. Afterwards they fluctuated between the third and fourth tiers, reaching the promotion playoffs of the former in 1991 and 2006 but subsequently falling short. In 1992, a change in rules forced the team to change its name, and it was renamed Real Sociedad de Fútbol B. Liga de Fútbol Profesional's rules prohibit B clubs from having different names from their parent club, the exceptions being Real Madrid Castilla and Sevilla Atlético. Upon celebrating its 50-year anniversary in 2007, the team had used 486 players, preparing dozens to represent the first team including the vast majority of the squad that won the Spanish championship twice in succession (1980–81 and 1981–82).

A change in the club structure from 2016 meant that most Sanse players would be promoted from a new subsidiary, Real Sociedad C (previously known as Berio), who would play in Tercera División with under-20 graduates of the club's youth system. The Real Sociedad C team must play at least one division below Real Sociedad B.

In the 2017–18 season, the team finished third in Group 2.^[3] In 2020–21, Sanse won their group and gained promotion to the second division 59 years since their last appearance, after defeating Algeciras in the promotion play-off finals.^[4][5] On 22 May 2022, Sanse was relegated back to the third tier after only one season in the second tier.

• Real Sociedad de Fútbol Junior – (1955–57)
• San Sebastián Club de Fútbol – (1957–91)
• Real Sociedad de Fútbol "B" – (1991–92)
• Real Sociedad de Fútbol, S.A.D. "B" – (1992–)

• As a reserve team of Real Sociedad

• Merged with Real Sociedad

• 3 seasons in Segunda División
• 3 seasons in Primera Federación
• 35 seasons in Segunda División B
• 27 seasons in Tercera División

As of 30 August 2023.^[6]

Note: Flags indicate national team as defined under FIFA eligibility rules. Players may hold more than one non-FIFA nationality.

No.	Pos.	Nation	Player
16	MF	FRA	Alex Lebarbier
17	DF	ESP	Jon Martín
18	MF	ESP	Eder García
19	FW	ESP	Ekain Azkune
20	MF	ESP	Mikel Rodríguez
21	MF	ESP	Jon Balda
22	DF	ESP	Iñaki Rupérez
23	DF	ESP	Unax Agote
25	GK	ESP	Aitor Fraga
27	FW	KEN	Job Ochieng
28	FW	ESP	Ekain Orobengoa
29	DF	ESP	Luken Beitia
30	GK	ESP	Lander Olasagasti

Note: Flags indicate national team as defined under FIFA eligibility rules. Players may hold more than one non-FIFA nationality.

No.	Pos.	Nation	Player
35	FW	ESP	Darío Ramirez
36	DF	ESP	Jon Merino
37	FW	ESP	Jakes Gorosabel

Note: Flags indicate national team as defined under FIFA eligibility rules. Players may hold more than one non-FIFA nationality.

No.	Pos.	Nation	Player
—	FW	ESP	Asier Teijeira (at Unionistas until 30 June 2024)

Position	Staff
Head coach	Sergio Francisco
Assistant coach	Iosu Rivas
Goalkeeping coach	Luis Castro
Analyst	Jon Gorrotxategi
Fitness coach	Karla Larburu
Mental coach	Jon Ollora
Physio	Asier Caballe Txomin Zinkunegi
Nutritionist	Natalia Ibañez
Match delegate	Iñaki Arostegi

• Victor Fuchs^[7]

• Segunda División B:
  • Winners:^[a] 2020–21^[b][4]
• Tercera División:
  • Winners:^[a] 1959–60^[c]
  • Winners:^[d] 1979–80,^[e] 1998–99,^[f] 1999–2000,^[g] 2009–10^[h]

Real Sociedad B hold home games at Instalaciones de Zubieta, which holds 2,500 spectators.

Players of both the first and the second teams train in these facilities, with Sanse's players being nicknamed "Potrillos" ("Colts") as the grounds are located near the city's horse racetrack.

• Category:Real Sociedad B footballers
• Real Sociedad
• Real Sociedad C
• Real Sociedad cantera – youth section

• Official website (in Spanish, Basque, and French)
• Futbolme team profile (in Spanish)
• La Preferente team profile (in Spanish)