Undertow is the debut full-length album by American rock band Tool, released in 1993. It was certified double platinum by the RIAA on May 14, 2001.

The album was recorded between October and December 1992 at Sound City Studios, Van Nuys, Los Angeles, California, and at Grandmaster Recorders, Hollywood, California, by Sylvia Massy. Some of the songs featured on the album are songs that the band decided to not release on their first EP, Opiate. More: en.wikipedia.org.