The Zrinski-Frankopan conspiracy of 1664-1670 is a movement in which the Croatian noblemen of the Zrinski and Frankopan families rebel against their ruler, King Leopold I of the Habsburg family.

They feel he has disregarded the treaty that he was bound to upon being crowned as the king of the Lands of the Crown of St. Stephen, especially after the Vasvár Peace in 1664.

The poorly organized attempt at revolt gave the Habsburgs reason to clamp down on their opponents.

It was named after Count Ferenc Wesselényi, a Hungarian noble and by Croatian counts Nikola Zrinski and Petar Zrinski and count Fran Krsto Frankopan.In Hungarian historiography the conspiracy also named Wesselényi conspiracy after the highest ranking (count palatine) member.