"Into the Void" is a song by British heavy metal band Black Sabbath, released in 1971 on their album Master of Reality. An early version of "Into the Void" called "Spanish Sid" was released on the deluxe edition of Master of Reality. It is written in the key of C# minor.
Various artists have covered the song, including Soundgarden, Kyuss, Monster Magnet, Melvins, Sleep, Dr. Know, Cavity, Exhorder, Lumsk, Dimmi Argus and Orange Goblin.
In Soundgarden's version, the original lyrics are replaced by words of protest by Chief Seattle, which fit the metre of the song. At the 35th Annual Grammy Awards, the appropriately renamed "Into the Void (Sealth)" received a nomination for Best Metal Performance.