Josiah Harlan, Prince of Ghor (June 12, 1799 − October 1871) is an American adventurer, best known for travelling to Afghanistan and Punjab with the intention of making himself a king.

While there, he becomes involved in local politics and factional military actions, eventually winning the title Prince of Ghor in perpetuity for himself and his descendants in exchange for military aid.

Rudyard Kipling's short story The Man Who Would Be King is believed to be partly based on Harlan.