Q.E.D. is a 1982 short-lived adventure series set in Edwardian England, starring Sam Waterston as Professor Quentin Everett Deverill. The Professor was a scientific detective in the mold of Sherlock Holmes, and the series had a smattering of what would later be called steampunk. In the show, the lead character was known primarily by his initials, Q.E.D; the reference here is that Q.E.D. usually stands for quod erat demonstrandum, a statement signalling the end of a proof. The show aired on the CBS network in the United States, and on Channel 4 in the United Kingdom.

Q.E.D. ran for 1 season. No new episodes are scheduled.