Deja Entendu (French for "already heard") is the second studio album by American rock band Brand New, released on June 17, 2003 by Triple Crown Records and Razor & Tie. It was widely praised for showing the band's maturation from their pop punk debut Your Favorite Weapon, and critics described the album as the moment when the band "started showing ambition to look beyond the emo/post-hardcore scene that birthed them."

The album, considered the band's "breakthrough", was Brand New's first to chart in the United States (at number 63), and its two singles "The Quiet Things That No One Ever Knows" and "Sic Transit Gloria... Glory Fades" both reached the top 40 in the United Kingdom Singles Chart and earned MTV airplay. It was certified Gold nearly four years after its release. Its commercial success led to Brand New signing with DreamWorks/Interscope Records shortly after.

The album received very positive reviews and has since been placed on numerous lists as one of the greatest albums of the decade and from the emo genre.