Ratt (stylized as RATT) is an American heavy metal band that had significant commercial success in the 1980s, with their albums having been certified as gold, platinum, and multi-platinum by the RIAA. The group's singles "Round and Round" and "Lay It Down" ranked on Billboard's top 40 at No. 12 and No. 40, respectively. Other significant Ratt songs include "Wanted Man", "You're in Love" and "Dance". Along with groups such as friendly rivals Mötley Crüe, Ratt has been recognized as instrumental in the formation of the early 1980s Los Angeles glam metal scene, also known as "hair metal" or "pop metal".

The band has continued to tour and record following extended hiatuses and line-up changes. Their latest album, Infestation, was released on April 20, 2010.