Osanna of Cattaro was a 16th-century Catholic mystic and anchoress born Jovana Kosić. Originally raised in an Eastern Orthodox priestly family in Zeta, she later converted to Catholicism and moved to the coastal town of Cattaro, in modern-day Montenegro. Following a spiritual calling, she lived as a recluse in a cell, eventually becoming a member of the Third Order of Saint Dominic. Known for her intense prayer life and numerous visions, she became a significant spiritual guide for the local community and a leader to a group of Dominican sisters.