Viscount Norwich, of Aldwick in the County of Sussex, is a title in the Peerage of the United Kingdom. It was created on 5 July 1952 for the Conservative politician, author and former ambassador to France, Sir Duff Cooper. He was the son of Sir Alfred Cooper and the husband of Lady Diana Manners. The second Viscount, who succeeded his father in 1954, was a well-known historian, travel writer and television personality. As of 2018 the title is held by his son, the third Viscount, who succeeded his father in that year.
The author Artemis Cooper is the daughter of the second Viscount Norwich.
There is no heir to the viscountcy.