| Principia Sardonica | |
| Type: | Studio album |
| Artist: | Rigor Sardonicous |
| Cover: | Principia Sardonica.jpg |
| Released: | 2004 |
| Genre: | Doom metal, funeral doom, death-doom |
| Length: | 61:41 |
| Label: | Paragon Records |
| Prev Title: | Apocalypsis Damnare |
| Prev Year: | 1999 |
| Next Title: | Vallis Ex Umbra De Mortuus |
| Next Year: | 2008 |
Principia Sardonica is the second studio album by the American heavy metal band Rigor Sardonicous. It was released in 2004 on Paragon Records and is the band's first full-length album in 5 years. The album contains the 15-minute track "Possession".