The Great God Pan is a horror and fantasy novella by Welsh writer Arthur Machen. Machen was inspired to write The Great God Pan by his experiences at the ruins of a pagan temple in Wales. What would become the first chapter of the novella was published in the magazine The Whirlwind in 1890. Machen later extended The Great God Pan and it was published as a book alongside another story, "The Inmost Light", in 1894. The novella begins with an experiment to allow a woman named Mary to see the supernatural world. This is followed by an account of a series of mysterious happenings and deaths over many years surrounding a woman named Helen Vaughan. At the end, the heroes confront Helen and force her to kill herself. She undergoes a series of supernatural transformations before dying and she is revealed to be the child of Mary and the god Pan.