Hanzel und Gretyl are an American industrial metal band founded in New York City by Kaizer von Loopy and Vas Kallas in February 1993.

During the same year, Hanzel und Gretyl's song "9D Galactik Center" appeared in New Line Cinema's Mortal Kombat Annihilation and was also played at the 1997 MTV Music Awards.

Described by Kaizer von Loopy as a "futuristic Wagnerian rock opera" and released in 2003, it marked a distinct stylistic change for the band favoring heavy guitar riffs and Germanic themes over the more genre expanding electro-metal style for which they had become known in the 1990s.

The CD was met with a fair amount of controversy over its parodic cross-referencing of both German and American stereotypes set against a surreal and spaced-out WWII backdrop but nevertheless attained a four out of five star review in Kerrang!

Beginning in June 2012, Hanzel und Gretyl followed up the completion of Born to Be Heiled with multiple extensive headlining tours including Australia, New Zealand, US, Canada, Russia, and Europe.

Hanzel und Gretyl für immer, an album composed entirely of remixes of their previous CD, Born to Be Heiled, was completed by Kaizer von Loopy in July 2013 and slated for worldwide release by Metropolis Records on October 8, 2013.

Perhaps their darkest and most metal sounding release to date, BFM employs satanic themes cross-referenced with forest motifs from the original Brothers Grimm fairy tale.

2015 found Hanzel und Gretyl playing select dates in the US and returning in October to Europe, UK, Russia and also Greece for the first time in the band's history.