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William Henry "Lone Star" Dietz (August 17, 1884 - July 20, 1964) was an American football player and coach. He served as the head football coach at Washington State University (1915-1917), Purdue University (1921), Louisiana Tech University (1922-1923), University of Wyoming (1924-1926), Haskell Institute--now Haskell Indian Nations University (1929-1932), and Albright College (1937-1942). From 1933 to 1934, Dietz was the head coach of the National Football League's Boston Redskins, where he tallied a mark of 11-11-2. He was inducted into the College Football Hall of Fame as a coach in 2012.

Historian Linda M. Waggoner has traced Dietz' heritage in several articles in Indian Country Today Media Network and at a 2013 symposium at the National Museum of the American Indian. According to census records and to his birth certificate, he was born William Henry Dietz, or "Willie," on August 17, 1884, in Rice Lake, Wisconsin, at 16 West Humbird Street. His father William Wallace Dietz, settled in the area in 1871 and was elected county sheriff in 1877. He married Leanna Ginder in November 1879. "Willie" attended Oklahoma's Chilocco Indian Agricultural School, where it is likely he feigned some kind of Indian identity for the first time. As Waggoner wrote, "Naturally, visitors to the St. Louis World's Fair exhibit, including Dietz's future wife, Winnebago artist Angel De Cora (1871-1919), thought Dietz was a Chilocco student."  In 1921, Dietz took a coaching position with Purdue University in Indiana. After Angel De Cora died in 1919, he married Doris O. Pottlitzer, a middle-aged local journalist, on January 29, 1922. The week previous to their marriage, Purdue officials fired him for illegal recruiting. In spring 1933, George Preston Marshall, owner of the Boston Braves, hired Dietz to replace Coach Lud Wray. In 1937, the team moved to Washington, D.C.  For the rest of his life, Dietz continued to promote himself as Lone Star Dietz, the son of W.W. and Julia One Star of Pine Ridge. He took on his last coaching job in 1937 for Albright College in Pennsylvania; in 1964, still married to Doris, Dietz died in Reading, Pennsylvania. He and Doris were so poor that former teammates purchased his headstone. It reads: "William 'Lone Star' Dietz born in South Dakota."
William Henry Dietz