John Francis Grady (born 1929) is a United States federal judge.
Born in Chicago, Illinois, Grady attended Lake Forest Academy, a nationally known private school for boys, and graduated in 1948. He subsequently received a B.S. from Northwestern University in 1952 and a J.D. from Northwestern University School of Law in 1954. He was in private practice in Chicago, Illinois from 1954 to 1956. He was a Chief, Criminal Division, U.S. Attorney's Office, Northern District of Illinois from 1956 to 1961. He was in private practice in Waukegan, Illinois from 1961 to 1976.
Grady was a federal judge on the United States District Court for the Northern District of Illinois. Grady was nominated by President Gerald Ford on October 20, 1975, to a seat vacated by Edwin A. Robson. He was confirmed by the United States Senate on November 20, 1975, and received his commission on November 21, 1975. He served as chief judge from 1986-1990. He assumed senior status on May 23, 1994.