| Club: | Real Sociedad B |
| Season: | 2021–22 |
| Chrtitle: | President |
| Chairman: | Jokin Aperribay |
| Mgrtitle: | Head coach |
| Manager: | Xabi Alonso |
| Stadium: | Anoeta |
| League: | Segunda División |
| League Result: | 20th (relegated) |
| League Topscorer: | Jon Karrikaburu (11) |
| Season Topscorer: | Jon Karrikaburu (11) |
| Pattern La1: | _realsociedad2122h |
| Pattern B1: | _realsociedad2122h |
| Pattern Ra1: | _realsociedad2122h |
| Pattern Sh1: | _realsociedad2122h |
| Pattern So1: | _realsociedad2122h |
| Leftarm1: | FFFFFF |
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| Rightarm1: | FFFFFF |
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| Pattern La2: | _realsociedad2122a |
| Pattern B2: | _realsociedad2122a |
| Pattern Ra2: | _realsociedad2122a |
| Pattern Sh2: | _realsociedad2122a |
| Pattern So2: | _realsociedad2122a |
| Leftarm2: | 7b121b |
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| Prevseason: | 2020–21 |
| Nextseason: | 2022–23 |
The 2021–22 season was the 67th season in the existence of Real Sociedad B and the club's first season back in the second division of Spanish football since 1962.
See main article: Real Sociedad C.
See main article: 2021–22 Segunda División.
The league fixtures were announced on 30 June 2021.[2] [3]