The untitled fourth studio album by the English rock band Led Zeppelin, commonly known as Led Zeppelin IV, was released on 8 November 1971 by Atlantic Records. It was produced by guitarist Jimmy Page and recorded between December 1970 and February 1971, mostly in the country house Headley Grange. The album is notable for featuring "Stairway to Heaven", which has been described as the band's signature song.
The album was a commercial and critical success and is Led Zeppelin's best-selling, shipping over 37 million copies worldwide. It is one of the best-selling albums in the US, while critics have regularly placed it highly on lists of the greatest albums of all time.
Releasing the album without an official title has made it difficult to consistently identify. While most commonly called Led Zeppelin IV, Atlantic Records catalogues have used the names Four Symbols and The Fourth Album. It has also been referred to as ZoSo (which Page's symbol appears to spell), Untitled, and Runes.