Rigor Sardonicous is an American doom metal band from Long Island, New York, United States. Coined as "raw, apocalyptic doom", Rigor Sardonicous is one of the earliest American doom metal bands that are still active today among Novembers Doom and Evoken. The band members are committed to unearthing the darkest, deepest funeral doom sounds imaginable since coming together in 1988. According to one interview, the band is influenced by slow parts of death metal bands like Obituary, Winter and Autopsy.
The band's name is Latin for "Rigid and sardonic"; the vast majority of their album and song titles are in Latin. However, the lyrics are still in English. On most of their recordings, the band uses a Boss DR-660 Dr. Rhythm drum machine.