William J. Juneau (February 24, 1879 – October 9, 1949) was an American football player and coach of football, basketball, and baseball. He served as the head football coach at Colorado College (1904), South Dakota State College of Agricultural and Mechanic Arts (1906–1907), Marquette University (1908–1911), the University of Wisconsin–Madison (1912–1915), the University of Texas at Austin (1917–1919), and the University of Kentucky (1920–1922), compiling a career college football record of 86–39–10. Juneau was also the head basketball coach at South Dakota State for two seasons from 1905 to 1907, tallying a mark of 7–5. He coached baseball at South Dakota State in 1906 and 1908 and at Wisconsin in 1913, amassing a career college baseball record of 15–12–1.

Juneau was the grandnephew of Solomon Juneau (1793–1856), a fur trader, land speculator, and politician who helped found the city of Milwaukee, Wisconsin. Juneau played football at Wisconsin as an end and halfback from 1899 to 1902 and captained the Wisconsin Badgers football team in 1902. He began his coaching career in 1903 at Fort Atkinson High School in Fort Atkinson, Wisconsin. Juneau retired from coaching 1923 and entered the real estate business.

He died on October 9, 1949, at the age of 70 in Milwaukee, Wisconsin.^[1]