Joseph Francis Ladue (July 28, 1855 – June 27, 1901) was a prospector, businessman and founder of Dawson City, Yukon, Canada.
Ladue was born in Schuyler Falls, New York. His mother died when he was seven years old, and his father in 1874. Upon his father's death, 19-year-old Joe headed west.
In 1876, he found employment in a gold mine in Deadwood, South Dakota, beginning as a general labourer and working his way up to engineer, foreman and superintendent. He eventually quit to go prospecting in Arizona and New Mexico, but did not strike it rich. In 1882, he crossed the Chilkoot Pass into the interior of the Yukon, where he prospected and traded for a couple of years.