"Irreplaceable" is a song by American R&B singer Beyoncé Knowles. The song was written by Knowles, Ne-Yo, Tor Erik Hermansen, Mikkel S. Eriksen, Espen Lind, Amund Bjørklund, and produced by Stargate and Knowles for her second solo album, ''B'Day'' (2006). Originally not created for Knowles, she re-arranged the demo presented by the producers—a country-turned-pop-contemporary R&B song. The lyrics refer to breaking up with an unfaithful man, part of Knowles and Ne-Yo's vision of creating a record that people could relate to, and was considered an anthem to female empowerment.
Following the less successful chart performances of "Déjà Vu" and "Ring the Alarm", "Irreplaceable" was released on December 5, 2006 in the United States as the album's third single, and the second single in most international music markets. "Irreplaceable" was a worldwide commercial and critical success, becoming Knowles' second best-selling single in her solo career after "Crazy in Love" and ''B'Day''s most successful release. The single performed well on the US ''Billboard'' Hot 100, remaining at the top spot for ten consecutive weeks. Certified multi-platinum, "Irreplaceable" is the US' best-selling single in 2007 and the 25th most successful song of the 2000s, according to the ''Billboard'' Hot 100 Songs of the Decade.
"Irreplaceable" was lauded by contemporary critics, citing its distinct production compared with most tracks featured on the album. The song won awards, including one during the 2007 Soul Train Music Award. The single's music video, which features the debut performance of Knowles' all-female band Suga Mama, earned Knowles additional awards. ''Rolling Stone'' ranked it number sixty on their list of 100 Best Songs of the 2000s decade.