Lost and Found is the third studio album by American heavy metal band Mudvayne. The album was released on April 12, 2005. The album had major success in the U.S., debuting at number 2 and being certified gold by the RIAA shortly afterward. It has sold about 1,000,000 copies as of August 2014 and is the band's most successful album to date.

Mudvayne is an American heavy metal band formed in Peoria, Illinois, in 1996. Known for their sonic experimentation, face and body paint, masks and uniforms, the band has sold over six million records worldwide, including nearly three million in the United States. The group consists of guitarist Greg Tribbett, drummer Matthew McDonough, lead vocalist Chad Gray, and bassist Ryan Martinie. The band became popular in the late-1990s Peoria underground music scene, and they found success with the single "Dig" from their debut album L.D. 50 (2000). After releasing four more albums and touring relentlessly for nearly a decade, Mudvayne went on hiatus in 2010. They reunited in 2021 and continue to perform live.