Algorythum is the fifth studio album by Mentallo & The Fixer, released on February 16, 1999, by Metropolis Records. It was the band's first release without founding member Dwayne Dassing and was dedicated to his sister Danielle Dassing.

Mentallo and the Fixer is the project name used by Texan electro-industrial musicians Gary Dassing (Mentallo) and Dwayne Dassing from 1988 to 1999, and by Gary Dassing alone from 1999 to the present day. The band has several releases on the American record label, Metropolis Records. They are named after two Marvel Comics characters.