"Sæglópur" (Icelandic for "lost at sea" or "lost seafarer") is a song by Sigur Rós, released in 2006 as a single from the 2005 album Takk.... Parts of the song are in Icelandic, although a lengthy portion is in Hopelandic, a "language" of nonsense words selected by the band that sound similar to Icelandic.

The music video for the song track depicts the drowning of a young child, who is, towards the end of the video, rescued by a diver and, as in the "Glósóli" video, whether the child survives is left for the viewer to decide.

A part of "Sæglópur" was used by video game developers Ubisoft Montreal, for their Prince of Persia trailer on the E3 2008 event in Los Angeles on 15 July 2008. The song has continued to be used by the company, appearing in the televised commercials for the game. A clip of the song had also been used in an ad aimed at young people with eating disorders, running on Swedish television by Anorexi Bulimi-Kontakt. The ad was released in 2007.

Also, parts of this song have been used in the British car review television series Top Gear on numerous occasions.

Parts of the song were used in the trailer for Julie Taymor's film adaptation of Shakespeare's The Tempest.

The intro of this song is used in one of the Invisible Children Bracelet Campaign videos: "Roseline: The Story of an AIDS Victim." It can be heard during part of the documentary and as the DVD menu music.

Parts of the song are used in previews of Human Planet on Discovery Channel.

Parts of the song were used for the trailer of the second half of the first season of the Starz hit show, Outlander.

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