"3 Libras" is a song by alternative rock band A Perfect Circle. The song was the second single from their debut album Mer de Noms. The song was well received both critically and commercially, with it peaking at number 12 on both the Billboard US Modern Rock and Mainstream Rock charts in 2001.

As with all of the Mer de Noms album, "3 Libras'" music was written by guitarist Billy Howerdel, while the lyrics were written by vocalist Maynard James Keenan. The two originally envisioned the track to be the first single of their debut album prior to being talked into going with the hard rock track "Judith" by record label executives, who felt the track was a better lead off single due to it being less of a departure from Keenan's other band, Tool.

Two official remixed versions of the song have been made; the "Feel My Ice Dub Mix" by band member Danny Lohner, and the "All Main Courses Mix" by Robert "3D" Del Naja of Massive Attack. They were compiled in 2004 on the band's remix album Amotion.

While much of Mer de Noms sound is identified with a conventional hard rock aesthetic, "3 Libras" sound is primarily driven by acoustic guitar and violin. Majority of the song consists of melodic, clean guitar tones, and a violin melody played over, composed by band bassist and violinist Paz Lenchantin.Drummer Josh Freese plays the rim of the drumkit on every eighth note, with the song being performed in 6/8. The song finishes with a full-band performance and distorted electric guitars in the song's outro, ending on a dark guitar chord.

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