The E.N.D. (an abbreviation of and subtitled The Energy Never Dies) is the fifth studio album by American group the Black Eyed Peas. It was released on June 3, 2009, by Interscope Records.

While on The Monkey Business Tour, on which they embarked in support of their fourth studio album Monkey Business (2005), the Black Eyed Peas began recording material for their fifth studio album. Tentatively titled From Roots to Fruits, it was originally set for a late 2007 release, before being retitled and postponed several times. Executive producer will.i.am produced The E.N.D. with fellow member apl.de.ap and longtime collaborators Printz Board and Poet Name Life, alongside Jean Baptiste, David Guetta, DJ Replay, Funkagenda, Keith Harris, Mark Knight and Frederic Riesterer. Their final product was an EDM, electro-funk, pop and hip hop record significantly differing from their previous albums. However, its lyrical themes were similar to its predecessors Elephunk (2003) and Monkey Business.

Upon its release, The E.N.D. received mixed to positive reviews from music critics, who described it as containing more anthemic and inspirational songs in the group's bid to appeal to a new generation of music listeners. It was the Black Eyed Peas' first number-one album on the US Billboard 200, debuting atop the chart with first-week sales of 304,000 copies. Internationally, it reached number one in Australia, Belgium, Canada, France, New Zealand and Portugal. At the 52nd Annual Grammy Awards, the album was nominated for six awards, including Album of the Year, and Record of the Year for "I Gotta Feeling", and won the award for Best Pop Vocal Album. By June 2011, the album had sold over 11 million copies worldwide, being one of the best-selling albums of its era.

The E.N.D. produced five singles, all of which peaked within the top ten on the US Billboard Hot 100. "Boom Boom Pow" and "I Gotta Feeling" led the Billboard Hot 100 back-to-back, putting the band at the summit for a record-breaking 26 consecutive weeks. The group's first two number-one singles on the chart, the former spent 12 weeks atop the chart and the latter spent 14. "Meet Me Halfway" peaked at number seven on the Billboard Hot 100 and at number one in nine countries. "Imma Be" was the group's third Billboard Hot 100 number-one hit, and reached the top ten in Australia, Canada and Hungary. The final single "Rock That Body" peaked at number nine on the Billboard Hot 100 and within the top ten in nine countries. To further promote the album, the group embarked on The E.N.D. World Tour (2009–2010).