Joseph Peter Stadtmueller (born January 28, 1942) is a United States federal judge.
Born in Oshkosh, Wisconsin, Stadtmueller received a B.A. from Marquette University in 1964 and a J.D. from Marquette University Law School in 1967. He was in private practice in Milwaukee, Wisconsin from 1968 to 1969. He was an assistant U.S. Attorney of the Eastern District of Wisconsin from 1969 to 1974, and then first assistant for that district from 1974 to 1975. He returned to private practice from 1975 to 1976, but was again an assistant U.S. Attorney from 1977 to 1978, then Deputy U.S. attorney from 1978 to 1981, finally becoming the United States Attorney for the Eastern District of Wisconsin from 1981 to 1987.
On March 3, 1987, Stadtmueller was nominated by President Ronald Reagan to a seat on the United States District Court for the Eastern District of Wisconsin vacated when John W. Reynolds, Jr. took senior status. Stadtmueller was confirmed by the United States Senate on May 19, 1987, and received his commission on June 1, 1987. He served as chief judge from 1995 to 2002.