| The Duke in Darkness | |
|---|---|
 First edition, 1943 | |
| Written by | Patrick Hamilton |
| Date premiered | 7 September 1942 |
| Place premiered | Royal Lyceum Theatre, Edinburgh, Scotland |
| Original language | English |
| Genre | Psychological drama |
| Setting | Around 1580 in the imaginary French province of Lamorre |
The Duke in Darkness is a 1942 play by Patrick Hamilton. A psychological drama set during the French Wars of Religion, it was first staged on 7 September 1942 at the Royal Lyceum Theatre in Edinburgh. It ran for 72 performances (8 October – 5 December 1942) at the St. James Theatre, London, and had a brief run on Broadway in 1944.