Winfred George Knoch (May 24, 1895 – May 23, 1983) was a United States federal judge.
Born in Naperville, Illinois, Knoch received an LL.B. from DePaul University in 1917. He immediately entered private practice in Naperville, Illinois, but served as a lieutenant in the United States Army infantry during World War I, from 1917 to 1919. He then returned to private practice until 1930, also serving as an assistant state's attorney of DuPage County, Illinois from 1922 to 1930. He was a judge in DuPage County from 1930 to 1939, and on the 16th Judicial Circuit Court of Illinois from 1939 to 1953.
On April 27, 1953, Knoch was nominated by President Dwight D. Eisenhower to a new seat on the United States District Court for the Northern District of Illinois created by 64 Stat. 443. He was confirmed by the United States Senate on May 13, 1953, and received his commission the following day.
On August 16, 1958, Eisenhower elevated Knoch to the seat on the United States Court of Appeals for the Seventh Circuit vacated by Walter C. Lindley. Knoch was confirmed by the United States Senate on August 19, 1958, and received his commission on August 21, 1958. He assumed senior status on December 4, 1967, serving in that capacity until his death.