Taking Back Sunday is an American rock band from Amityville, New York, formed by guitarist Eddie Reyes and bassist Jesse Lacey in 1999. The band's current members are Adam Lazzara (lead vocals), John Nolan (lead guitar, keyboards, vocals), Shaun Cooper (bass guitar) and Mark O'Connell (drums), accompanied by Nathan Cogan (guitar) for their live performances. The band's former members include Lacey, Reyes, bassist Matthew Rubano, and guitarist-vocalists Fred Mascherino and Matthew Fazzi.

Lacey quit Taking Back Sunday in 1999 and in 2000 formed the rock band Brand New, with whom Taking Back Sunday would become embroiled in a highly publicized feud. Lazzara replaced original vocalist Antonio Longo prior to the release of the band's 2002 debut album Tell All Your Friends. Nolan and Cooper left the band in 2003 to form Straylight Run before returning in 2010. The band's breakthrough album, 2006's Louder Now, featured the popular lead single "MakeDamnSure", sold over 900,000 copies, and peaked at No. 2 on the United States Billboard 200, surpassing the band's previous Billboard 200 peak in 2004 at No. 3 with Where You Want to Be.

They released their eighth studio album, 152, in 2023.