"Mein Herz brennt" (German for "My heart burns") is a single by German industrial metal band Rammstein. The song first appeared as the opening song to the band's third album Mutter in 2001, and was used as the opening track for concerts during that era. In 2011 it appeared on the band's first greatest hits compilation titled Made in Germany 1995–2011, being the only song on the album that at the time of release had not been released as a single or had a music video.

The song was released as a single to promote the then-upcoming video collection Videos 1995–2012. A piano version of the song was released as a single on 7 December 2012.

The song's lyrics involve a narrator describing the terrors of nightmares. The opening line of the song's intro and chorus (Nun, liebe Kinder, gebt fein Acht. Ich habe euch etwas mitgebracht, meaning "Now, dear children, pay attention. I have brought something for you") is taken from the German children's TV show Sandmännchen ("Mr Sandman"), which provided children with a bedtime story. The song's narrator appears as a darker version of the character.

Two separate videos were produced for "Mein Herz brennt", one for the original version and another for the piano version. Both were filmed in the main bathroom of Beelitz-Heilstätten, and was directed by Zoran Bihać, who had previously directed the videos for "Links 2-3-4", "Mein Teil" and "Rosenrot". Bihać described the relationship between the two videos as 'yin and yang', with the piano version being the latter.

The music video for the piano version of the song premiered on 7 December 2012 on Vimeo. The video shows Till Lindemann wearing a black dress and fishnets, while also sporting black and white face paint. The entire bathroom is light red, and in the centre is a 'T' shaped pool emitting light. The video consists of close-ups on Lindemann singing from behind the pool, until the second verse begins, where he begins to walk to the pool's foot. As the song closes, Lindemann walks into it and its light fades. The music video for the piano version is the first video since "Mutter" to show only Lindemann.

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