John W. "Jack" Swilling (April 1, 1830 – August 12, 1878) was an early pioneer in the Arizona Territory. He is commonly credited as one of the original founders of the city of Phoenix, Arizona. Swilling also played an important role in the opening of the central Arizona highlands to white settlement. His discoveries resulted in a gold rush to the region, and this in turn led to the establishment of Arizona's first territorial capital at the mining town of Prescott.