UD San Sebastián de los Reyes B
| Full name | Unión Deportiva San Sebastián de los Reyes "B" | |||
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| Nickname(s) | Sanse B | |||
| Ground | Rafael Delgado Rosa, San Sebastián de los Reyes, Madrid, Spain | |||
| Capacity | 2,000 | |||
| President | Miguel Espinosa | |||
| Head coach | Miguel Ángel Martínez "Lobo" | |||
| League | Primera Autonómica de Aficionados – Group 1 | |||
| 2023–24 | Preferente de Madrid – Group 1, 10th of 18 | |||
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Unión Deportiva San Sebastián de los Reyes B is a Spanish football team based in San Sebastián de los Reyes, in the Community of Madrid. The reserve team of UD San Sebastián de los Reyes, they play in Primera Autonómica de Aficionados – Group 1, holding home matches at Polideportivo Municipal Rafael Delgado Rosa.