Black River House is a property in Southern Ireland which currently stands deserted on the banks of the Black River (Abhainn Dubh - Gaelic) in the small village of Kildubhan. This large 17th century farm building achieved notoriety when it became the site of a multiple murder and suicide in 1992, the so-called "Black River House Murders". On November 20th 1992 the first English owner of the house since its creation, John Victor Marchant, killed his wife Carole and their three children, Jake, Otis and Lucille in their sleep before hanging himself.

The story is currently being publicised by an investigative website, [1414], which has the stated aim of investigating what its editor regards as the unsolved aspects of the case. It also highlights the story of a band named "The Secret Method', who are alleged to have gone missing while trespassing on the empty house in 1996. Their intention was to spend six months creating an experimental album, imbued with the atmosphere of the infamous location. Within weeks all contact from the band ceased. On March 14th police forced entry and found their equipment still running, but no trace of the band.