Takk... ([ˈtʰaʰkː], Thanks...) is the fourth studio album by the Icelandic post-rock band Sigur Rós, first released in the United States by Geffen Records on 12 September 2005.

Unlike its predecessor ( ), the album's lyrics are mostly in Icelandic, with occasional elements of Vonlenska ("Hopelandic"), a scat-like form of gibberish.

"Hoppípolla" was used as the backing music to trailers for the highly acclaimed nature series Planet Earth and for the end credits of Match of the Day broadcasting the FA Cup Final.

"Sæglópur" was also notably used in Ubisoft's Prince of Persia E3 2008 gameplay debut trailer as well as their televised commercials for the game.

Instrumental versions of "Hoppípolla" and "Inní mér syngur vitleysingur" (off the band's 2008 album Með suð í eyrum við spilum endalaust) were featured back-to-back during the closing scenes of The Mitchells vs. the Machines.

In 2009, British electronic music artist Chicane produced a progressive trance remix of "Hoppípolla", titled "Poppiholla", which was on rotation on BBC Radio 1's B list in June 2009.