Soběslav I (also "Sobeslaus"; c.1075 – 14 February 1140) is Duke of Bohemia from 1125 until his death.
He is a member of the Přemyslid dynasty, the youngest son of Vratislaus II (d. 1092), the first Bohemian duke to also rule as king, with his third wife Świętosława of Poland.
