William Floyd Collins (July 20, 1887 – c. February 13, 1925) was an American cave explorer who became trapped and died in what became Mammoth Cave National Park. The incident earned major media attention during the efforts to rescue him.
During the early 20th century, in an era known as the Kentucky Cave Wars, spelunkers and property owners entered into bitter competition to utilize the bounty of caves for commercial profit from tourists, who paid to see the caves. In 1917 and 1918, Collins discovered and commercialized Great Crystal Cave in the Flint Ridge Cave System, but the cave was remote and visitors were few.