Býčí skála Cave (Czech: Býčí skála, German: Stierfelsen, English: The Bull Rock Cave) is part of the second longest cave system in Moravia, Czech Republic. It is also famous for archaeological discoveries. Except for the entrance, the cave is not accessible to the public, although occasionally it is opened for visitors. The cave is in the central part of the Moravian Karst, in the Josefovské Valley (Josefovské údolí) between the town of Adamov and the village of Křtiny. Together with the cave system Rudické propadání, Býčí skála forms the second longest cave system in the country, after the Amatérská Cave. Its known length is over 13 km.