Professional ratings
Aggregate scores
Source	Rating
Metacritic	74/100
Review scores
Source	Rating
Allmusic
Alternative Press
Drowned in Sound	(8/10)
E! Online	B+
Entertainment Weekly
Kludge	(6/10)
Mojo
Q
Rolling Stone
Spin

Thirteenth Step is the second studio album by American rock band A Perfect Circle, released on September 16, 2003. The album sold well, charting at the number 2 position on the Billboard 200 in its premiere week, selling over 231,000 copies and staying on the charts for 78 weeks. The album went on to be certified as gold on November 4, 2003 and as platinum on March 24, 2006 by the RIAA. Three singles were released from the album, "Weak and Powerless", which topped both the Mainstream Rock Tracks and Modern Rock Tracks, followed by "The Outsider" and "Blue", which also charted on the respective charts.

The band's writing process was very different from the band's first album, Mer de Noms. With the first album, a majority of the album had been already written and recorded over a long period of time by guitarist Billy Howerdel, before a band had even been assembled. He had recorded it with a female vocalist in mind, but upon Tool vocalist Maynard James Keenan hearing it and offering to sing for the material, the content was then quickly finalized upon adding Keenan's vocals and re-recording the drums with band member Josh Freese. With beginning the second album, the band found themselves starting fresh, without any material to start with, with the exception of the track "Vanishing", which originally was intended to be on the band's first album, but Howerdel could not find the song file in the studio, having accidentally named it "test". Upon finally recovering the track in 2001, it was only slightly altered for its final release, to better match the eventual sound of Thirteenth Step.

Writing for the album started while Keenan was still touring with his other band, Tool, in support of their 2001 album Lateralus. Howerdel would write most of the music, while Keenan would write most of the lyrics. As such, Howerdel would send work in progress instrumental he would create, and Keenan would write lyrics in between shows, a process they found to be efficient, but ultimately more difficult to balance than they initially expected. Keenan's work with Tool was not the only thing delaying work on the album, as progress was also hampered by other lineup changes, including guitarist Troy Van Leeuwen leaving to be a member of Queens of the Stone Age, and bassist Paz Lenchantin leaving to be a member of Zwan, leading to their contributions to the album being limited to only a few tracks. Lenchantin would be replaced by Marilyn Manson bassist Jeordie White, while Van Leeuwen would be replaced by Danny Lohner on the album and later James Iha for touring purposes, as Iha did not actually perform on the album.

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