The Great Impersonation is a 1920 mystery novel authored by E. Phillips Oppenheim. Just prior to World War I, German Leopold von Ragastein encounters his lookalike, Englishman Everard Dominey, in Africa and prepares to assassinate him and steal his identity in order to spy on English high society. However, in this story of romance, political intrigue, and a haunting past, concerns about the returned Dominey's true identity begin to emerge.