IBM 1401, A User's Manual is the fourth full-length studio album by Icelandic musician Jóhann Jóhannsson, released by 4AD on October 30, 2006.

The reissue was a double LP pressing on clear-coloured vinyl and included two previously unreleased live bonus tracks.

Pitchfork's Mark Richardson gave it a 6.9, saying that the record "begins beautifully" and has a "powerful finish", "but the long sag in the middle makes IBM 1401 – A User's Manual a bit harder to recommend overall.

"[7] Sal Cinquemani for Slant Magazine said that the album "gives you the sense of hearing something truly ancient being married to something very modern and present, and, then, something very futuristic.

"Some theorists claim humans can simulate anything with a computer, even a soul," Cinquemani concluded, "and with IBM 1401 - A User’s Manual, Jóhannsson comes chillingly close.