The Strange Case of Dr Jekyll and Mr Hyde is a gothic novella by the Scottish author Robert Louis Stevenson first published in 1886.

The work is also known 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 novella’s impact is such that it has become a part of the language, with the very phrase «Jekyll and Hyde» coming to mean a person who is vastly different in moral character from one situation to the next.