William Donald Stiehl (born December 3, 1925) is a United States federal judge.
Born in Belleville, Illinois, Stiehl was in the United States Navy Lieutenant during World War II, from 1943 to 1946 and again from 1950 to 1952. He received an LL.B. from Saint Louis University School of Law in 1949. He was in private practice in Belleville, Illinois from 1952 to 1986. He was an Assistant state's attorney of Belleville, Illinois from 1956 to 1960. He was a Special assistant attorney general of State of Illinois from 1970 to 1973.
Stiehl was a federal judge on the United States District Court for the Southern District of Illinois. Stiehl was nominated by President Ronald Reagan on May 14, 1986, to a new seat created by 98 Stat. 333. He was confirmed by the United States Senate on June 13, 1986, and received his commission on June 16, 1986. He served as chief judge from 1992-1993. He assumed senior status on November 30, 1996.