Oliver Wiswell is a historical novel written by Kenneth Roberts and published in 1940. The book tells the story of Oliver Wiswell, a young man from Massachusetts who joins the British army during the American Revolution. As the war progresses, Wiswell becomes disillusioned with the British cause and begins to sympathize with the American rebels. He eventually defects to the American side and becomes a spy for the Continental Army.

The novel is known for its detailed portrayal of the American Revolution from the perspective of a loyalist. Roberts, who was known for his meticulous research, used primary sources to create a historically accurate account of the war. The book was well-received upon its release and was praised for its vivid characters and realistic depiction of the era. Today, Oliver Wiswell is considered a classic of historical fiction and a valuable resource for anyone interested in the American Revolution.