Strange Case of Dr. Jekyll and Mr. Hyde is the original title of a novella written by the Scottish author Robert Louis Stevenson that was first published in 1886. The work is commonly known today as Dr. Jekyll and Mr. Hyde or simply Jekyll & Hyde. It is about a London lawyer named Gabriel John Utterson, who investigates strange occurrences between his old friend, Dr. Henry Jekyll and the evil Edward Hyde. The work is commonly associated with the rare mental condition often called "split personality" where, within the same body, there exists more than one distinct personality.

Robert Louis Stevenson (1850–1894) was a Scottish novelist, poet, essayist, and travel writer. His most famous works are Treasure Island, Kidnapped, and Strange Case of Dr Jekyll and Mr Hyde. A literary celebrity during his lifetime, Stevenson now ranks among the 26 most translated authors in the world.