William John Wills, English surgeon and explorer (died 1861)

William John Wills was a British surveyor who also trained as a surgeon. He was the second-in-command of the Burke and Wills expedition, which was the first expedition to cross Australia from south to north, finding a route across the continent from the settled areas of Victoria to the Gulf of Carpentaria. He and the expedition leader Robert O'Hara Burke both died of exhaustion on the expedition's return journey.

January 5 is the fifth day of the year in the Gregorian calendar; 360 days remain until the end of the year.