Professional ratings
Aggregate scores
Source	Rating
Metacritic	67/100
Review scores
Source	Rating
Allmusic
Consequence of Sound
CraveOnline	8/10
Decibel	7/10
Exclaim!	7/10
The Guardian
Loudwire
MetalSucks
Metal Forces	7/10
Metal Hammer	8/10
Rolling Stone
Pitchfork Media	5.8/10
PopMatters	6/10
Washington Post	positive

Infestissumam (Latin superlative adjective meaning very or most hostile, used by the band as "the most hostile" or "the biggest threat" in reference to the Antichrist) is the second full-length album by the Swedish heavy metal band Ghost. It was recorded in Nashville, Tennessee, produced by Nick Raskulinecz and released on April 10, 2013. It was released in North America by Loma Vista Recordings on April 16 in partnership with Republic Records, a division of Universal Music Group, marking the band's major label debut. The album was generally well-received, with several music publications placing it on their list of the best heavy metal albums of the year, and won the 2014 Grammis Award for Best Hard Rock/Metal Album. In late 2013, the band released a special edition of the album, called Infestissumam Redux.

All of the album's tracks except "Ghuleh" were written and demoed by the end of summer 2011. The band planned to record the album after their North American tour with Enslaved and Alcest; however Ghost had to pull out of the tour and both the band and Rise Above Records agreed the album should be released on a different label. A Nameless Ghoul said that the band was in a hurry to put out another record.

On signing to a major label for the album, a Ghoul said, "It was Tom Whalley who was interested in the band. [He] was looking to start his own label, which ended up being an imprint of Universal ... We felt that we might be self-conscious about making that move, but knowing his background, having someone like that, having him be an advocate for our band, within a big organization like Universal, felt like the closest thing you can get to being on an independent without being on an independent."

Ghost finally began recording the album in October 2012 in Nashville, Tennessee, with producer Nick Raskulinecz. The band said they chose Raskulinecz because "He’s good at working with a band without transforming the band into something else, rather than make them just flower as the band they are ... It turned out he didn’t want to change much at all, and that’s why he got the job." In 2015 a Nameless Ghoul said they were not 100% satisfied with the album's final production, citing time restraints forcing them to accept last minute mixing and mastering. They did have difficulties in the Nashville area; because of their Satanic lyrics the band could not find a choir to perform on their record. Even individual choristers turned down the work. The band said, "Then we told them what they were supposed to sing, and one of the guys almost cried, he took offense; it was really weird ... So we ended up recording the choir in Hollywood, where people have no problem with worshipping the Devil."

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