Leonard Patrick O'Connor Wibberley (9 April 1915 – 22 November 1983), who also published under the name Patrick O'Connor, among others, was a prolific and versatile Ireland-born author who spent most of his life in the United States. Wibberley, who published more than 100 books, is perhaps best known for five satirical novels about an imaginary country Grand Fenwick, particularly The Mouse That Roared (1955).