The Slavniks/Slavníks or Slavnikids was a dynasty in the Duchy of Bohemia during the 10th century. It is considered to be of White Croat origin. The center of the semi-independent principality was the gord of Libice located at the confluence of the rivers Cidlina and Elbe. The Slavníks competed with the Přemyslid dynasty for control over Bohemia and eventually succumbed to them.

The Duchy of Bohemia, also later referred to in English as the Czech Duchy, was a monarchy and a principality of the Holy Roman Empire in Central Europe during the Early and High Middle Ages. It was formed around 870 by Czechs as part of the Great Moravian realm. Bohemia separated from disintegrating Great Moravia after Duke Spytihněv swore fealty to the East Frankish king Arnulf in 895.