UD San Sebastián de los Reyes B
| Full name | Unión Deportiva San Sebastián de los Reyes "B" | |||
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| Nickname | 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 | Tercera Federación – Group 7 | |||
| 2024–25 | Primera Autonómica de Aficionados – Group 1, 1st of 18 (champions) | |||
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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 Tercera Federación – Group 7, holding home matches at Polideportivo Municipal Rafael Delgado Rosa.