"Tranquility Base Hotel & Casino" (stylized as Tranquility Base Hotel + Casino) is the sixth studio album by English rock band Arctic Monkeys, released on May 11, 2018, by Domino Recording Company. The album was written by frontman Alex Turner in 2016 on a Steinway Vertegrand piano at his home in Los Angeles. It was produced in Los Angeles, Paris, and London by frequent Arctic Monkeys collaborator James Ford and Turner, featuring a diverse group of guest musicians including Tom Rowley, Loren Humphrey, James Righton, Zach Dawes, Tyler Parkford, and Cam Avery. Turner designed the album artwork himself, depicting the titular resort with cardboard cut-outs and a tape recorder. The title refers to Tranquility Base, the site of the 1969 Apollo 11 Moon landing.
 
Despite its stylistic shift polarizing listeners, "Tranquility Base Hotel & Casino" received generally positive reviews and was named the best album of 2018 by Q magazine. It was nominated for the 2018 Mercury Prize and the Grammy Award for Best Alternative Music Album, with the single "Four Out of Five" earning a nomination for Best Rock Performance. The album marked the band's sixth consecutive number-one debut in the UK, becoming the country's fastest-selling vinyl record in 25 years, and their third top 10 album in the US. It also topped the charts in Australia, Belgium, the Netherlands, France, Greece, Portugal, Scotland, and Switzerland. The album was promoted through the singles "Four Out of Five" and "Tranquility Base Hotel & Casino," as well as a global tour and multiple television appearances.