Angel Rat is the sixth studio album released by Canadian heavy metal band Voivod. Produced by Terry Brown of Rush fame, it was released in 1991 by Mechanic/MCA Records and is the follow-up to their critically acclaimed release, 1989's Nothingface. On this album, Voivod adopted a more alternative/progressive/psychedelic rock sound, as opposed to the progressive metal of Nothingface and the thrash metal of previous releases. A music video was made for the song "Clouds in My House".

While Angel Rat was released on a major record label, the album initially received mixed reviews and was not as successful as Nothingface, though it has since gained a strong cult following.[citation needed] Before the release of the album, bassist Jean-Yves Thériault (Blacky) departed from the group, but rejoined in 2008 (he would later leave again in 2014).

Men Without Hats bandleader Ivan Doroschuk performs keyboards on "The Outcast". This was done in return for drummer Michel Langevin recording the drums for Men Without Hats' album Sideways, recorded around the same time, and participating in the tour to promote that album.

The master tapes for the album, as well as Nothingface and The Outer Limits, were lost in the 2008 Universal Studios fire.