The System of Doctor Goudron (French:Le système du docteur Goudron et du professeur Plume, also released in the United States as The Lunatics) is a 1913 French short silent horror film directed by Maurice Tourneur and starring Henri Gouget, Henry Roussel and Renée Sylvaire. It was adapted from a 1903 Grand Guignol play (also starring Gouget) by André de Lorde, which was itself based on the 1845 short story The System of Doctor Tarr and Professor Fether by Edgar Allan Poe. It has been called the first French feature-length horror film.The film was the first of two Grand Guignol adaptations directed by Tourneur, written by de Lorde, and starring Gouget and Roussel; the second would be 1914's Figures de cire.

It is currently considered lost and nobody has a full video of it.