"Billionaire" is the debut single by American recording artist Travie McCoy, featuring guest vocals from Bruno Mars. It is the lead single from McCoy's debut studio album, Lazarus. The song was produced by The Smeezingtons, which consists of Mars, Philip Lawrence and Ari Levine. Lyrically, McCoy imagines what would happen if he became a billionaire, referencing all the good he would do to others with the money along with his desire to be on the cover of Forbes magazine, "smiling next to Oprah and The Queen". As of July 2011, the song has sold 3 million digital downloads, making it Mars' third single to do so. The song was also included in Mars' performance in Super Bowl XLVIII halftime show in 2014. It was released in the UK via digital download on July 26, 2010.

Bruno Mars came up with the lyrical concept for "Billionaire" during a trip to London in which he was given £240 ($350) by his record label to spend for 11 days. He found the amount of money to be insufficient, and explained "We were like, 'Is this the biggest mistake we've ever made? We thought we were broke in California; what are we going to do here?' So we've got no money, and I'm walking the streets and came up with, 'I wanna be a billionaire, so freakin' bad.'" With the song, McCoy intended to avoid "superficial" lyrics in the wake of an economic recession, and added "There’s something to sing about here; if I was in the position to have a ridiculous amount of money, would I be selfish or selfless?’ I just took that concept and ran with it."

Later, Mars explained to Forbes that his own finances inspired him to write the tune.“I wouldn’t have to worry about, you know, ‘I can’t afford to get breakfast, so I’ll wait until lunchtime to eat,’” he said, explaining the song’s origins at his manager’s Hollywood Hills home. “If I was a billionaire, none of that would matter. I’d be eating diamond cereal.”

During the summer of 2009, The Smeezingtons (Mars, Philip Lawrence and Ari Levine) were booked for a week of studio sessions writing for Lupe Fiasco, B.o.B and McCoy. At the end of the week the group had created a scratch demo version of "Billionaire". The B.o.B song "Nothin' on You" was also conceived at this time. McCoy later joined The Smeezingtons in the studio to complete the full song. The radio edit of the song replaces the word Fucking with freaking and is 3:06 long instead of 3:30. The radio edit is available for download on iTunes.

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