Brand New was an American rock band from Long Island, New York. Formed in 2000, the band consisted of Jesse Lacey (vocals, guitar), Vincent Accardi (guitar, vocals), Garrett Tierney (bass guitar, vocals) and Brian Lane (drums, percussion); they were joined by Benjamin Homola (percussion) for their live performances. From 2005 to 2013, the band also included Derrick Sherman (guitar, backing vocals, keyboards). The band is recognized as one of the most influential within the 2000s emo scene, celebrated for making artistic statements with their music.

Lacey, Tierney and Lane all played in the band the Rookie Lot, from Levittown, New York. Lacey was also the founding bassist for Taking Back Sunday before leaving. With Accardi in 2000, they formed Brand New in Merrick, New York. The band signed to Triple Crown Records and in 2001 released their debut album Your Favorite Weapon. Their second album, Deja Entendu, was released in 2003 and marked a stylistic change for the band, one that garnered an extremely positive critical reception. The album's first two singles, "The Quiet Things That No One Ever Knows" and "Sic Transit Gloria... Glory Fades", both received airplay on MTV2 and Fuse TV, entering the top 40 on the United Kingdom Singles Chart. Deja Entendu was eventually certified gold in the United States.

Brand New moved to Interscope Records and released the critically acclaimed The Devil and God Are Raging Inside Me in 2006. "Jesus Christ" became their highest-charting single in the US, peaking at number 30 on the Alternative Songs chart. In March 2008, the band started their own record label, Procrastinate! Music Traitors. Their fourth album, Daisy, which saw Accardi become a significant lyricist for the band, was released in 2009 and reached number six on the Billboard 200.

The band released two non-album singles following Daisy: "Mene" in April 2015 and "I Am a Nightmare" in May 2016, also formally releasing the original demos for their third album which had been leaked on the internet a decade earlier. Brand New surprise-released their fifth and final album Science Fiction on August 17, 2017, two days after announcing its release on vinyl. Receiving both critical acclaim and commercial success, it became Brand New's first number-one album on the Billboard 200.

Though Lacey had stated that the band would disband in 2018, the band eventually did break up in late 2017, when he was accused of sexual misconduct occurring during the band's early days.