Vuk II Krsto Frankopan Tržački (English: Wolf II Christopher Frankopan of Tržac) was a Croatian nobleman and soldier of the Frankopan family, father of noted poet and politician Fran Krsto Frankopan. He was born about 1588.
He was the son of Gašpar I Frankopan Tržački, captain of Ogulin, and his wife Katarina née Lenković, daughter of Ivan Lenković, Uskoks leader. Educated in Ljubljana and in Italy, he started his military career as officer on the Croatian Military Frontier, later becoming a commander of Tržan Castle in Modruš (1612), captain of Ogulin (1618) and lieutenant colonel of Senj (1620).