Unorthodox Jukebox is the second studio album by American singer and songwriter Bruno Mars. It was released on December 7, 2012, by Atlantic Records and was made available to listen to in its entirety for a week before its release. It serves as the follow-up to Mars's debut record Doo-Wops & Hooligans (2010). Mars's writing and production team, the Smeezingtons, composed the whole record and worked with several past collaborators, Jeff Bhasker and Supa Dups, while enlisting new producers, such as Mark Ronson and Emile Haynie, and no guest vocalists.

The album was initially planned to be more "energetic" than his previous work, but ended up presenting a wide range of styles such as R&B, pop, reggae, rock, disco, funk and soul music. Lyrically, Unorthodox Jukebox revolves around the theme of relationships, incorporating more explicit lyrics and subjects than his previous material. Critical response to Unorthodox Jukebox was generally favorable; many reviewers compared Mars's work to that of his previous album, while others deemed its lyrics shallow.

It debuted at number two on the US Billboard 200, with first week sales of 192,000 copies, and later topped the chart. The record also reached number one in Australia, Canada, Switzerland, and the United Kingdom. The album was certified six-times platinum by the Recording Industry Association of America (RIAA), three times platinum by the Australian Recording Industry Association (ARIA), Music Canada (MC), Recorded Music NZ (RMNZ) and by the British Phonographic Industry (BPI). Unorthodox Jukebox was the fourth best-selling album in 2013 and it has since sold six million units globally as of 2016. In 2014, Unorthodox Jukebox won the Grammy Award for Best Pop Vocal Album at the 56th Grammy Awards and International Album of the Year at the Juno Awards.