De RigueurMortis is the fifth studio album by Australian alternative-rock group TISM, released in October 2001. The album peaked at number 24 on the ARIA Charts.

TISM are a seven-piece anonymous alternative rock band, formed in Melbourne, Australia on 30 December 1982 by vocalist/drummer Humphrey B. Flaubert, bassist/vocalist Jock Cheese and keyboardist/vocalist Eugene de la Hot Croix Bun, with vocalist Ron Hitler-Barassi joining the group the following year. These four members have formed the core of the band since their inception, with the line-up being rounded out by guitarists Leak Van Vlalen (1982–1991), Tokin' Blackman and Vladimir Lenin-McCartney (2022–present), as well as backing vocalists/dancers Les Miserables and Jon St. Peenis.