Ratt is an American hair/glam 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 is perhaps best known for hit singles such as "Round and Round" and "Lay It Down", each track having ranked on Billboard's top 40. Other songs such as "Wanted Man", "You're in Love" and "Dance" also have ranked there.

Along with groups like 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, with everyone from the principal line up in and out, releasing their latest studio album, Infestation, on April 20, 2010.