Mainstream Sellout is the sixth studio album by American musician Machine Gun Kelly. It was released through Bad Boy and Interscope Records on March 25, 2022. It serves as his second collaborative project with drummer and producer Travis Barker, following Tickets to My Downfall (2020). The album was initially announced under the title, Born with Horns, in August 2021, before being renamed in January 2022. The album's deluxe edition, subtitled "Life in Pink Deluxe", with six new tracks, was released on June 24.
For a record to served as a continuation of Kelly's transition into pop-punk, Mainstream Sellout was met with mixed reviews from critics. Kelly embarked on the Mainstream Sellout Tour to promote the album throughout 2022. The album was nominated for Best Rock Album at the 65th Annual Grammy Awards.