"Secular Haze" is a song by the Swedish heavy metal band Ghost. The track was released as the lead single from the group's second studio album Infestissumam. The song reached number 22 on The Official Finnish Charts.

On December 14, 2012, the website SecularHaze.com was created by Ghost. The website contained a sound clip of a new Ghost song without vocals. On the page was a clock ticking backwards and five candles, each playing one element of the new song when the user hovered over it with the mouse. The next day, the band uploaded a new song to their official YouTube channel, also called "Secular Haze". Later that day, they performed a special concert in their hometown of Linköping, Sweden, performing the entire Opus Eponymous record along with "Secular Haze" and their cover of "I'm a Marionette". Before "Secular Haze" was performed, Papa Emeritus, the band's vocalist, disappeared into the black of the stage to be replaced by Papa Emeritus II. After this concert, SecularHaze.com was updated to include a sixth candle containing the vocal track of the song "Secular Haze". Four days later, the band announced the title of their second album, Infestissumam, along with the webpage Infestissumam.com which showed the album's track list.

"Secular Haze" was the album's first single, given as a free digital download to fans signing up to the band's mailing list from December 15, 2012. A limited pressing of 10" vinyl records of the single was later released. On choosing "Secular Haze" as the first single, a Ghoul said "we wanted to present a song from the new record that sort of stood on its own but without being too far off from the first record". The single's B-side is the cover of ABBA's "I'm a Marionette", which features Dave Grohl of Nirvana and Foo Fighters on drums as well as production. The collaboration happened when, before going to Nashville to record the album, Ghost had a bunch of covers demoed and were discussing if they should squeeze them onto the album. " ... we were at a festival in Europe and Foo Fighters was playing, and we knew that Dave was a fan, and [when we talked to him] after a few handshakes and a few laughs, we were like Okay, so you liked the band? So do you want to do something? And he said yeah, and one month later we were in [his studio in] L.A. doing that." Ghost's version of "I'm a Marionette" was included on the deluxe and Japanese editions of Infestissumam. It and the other material recorded with Grohl was also released on the If You Have Ghost EP, which also includes a live performance of "Secular Haze".

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