"Nothin' on You" is the debut solo and lead single recorded by American rapper B.o.B from his debut studio album, B.o.B Presents: The Adventures of Bobby Ray. The track features American singer-songwriter Bruno Mars on the chorus. It was written by Bobby Ray Simmons, Jr., along with Mars, Philip Lawrence and Ari Levine of The Smeezingtons. The production was handled by the latter three as The Smeezingtons. It was first released on December 15, 2009 via digital download by Atlantic Records. The song was supposed to be for Lupe Fiasco, however Atlantic Records' chairman, Craig Kallman, gave the song to B.o.B after listening to Fiasco's version and being displeased. The song took several months to finish and was born from a hummed melody by Mars and Lawrence.

"Nothin' on You" is a R&B, hip-hop and pop "southern rap ballad". Music critics gave the song generally positive reviews, praising it for its sweetness and positive vibe, while a few criticized the track due to Mars' performance. The song's main structure relies on a piano, a "helmed-beat", funky elements and a sample of Joe Tex's "I Gotcha". Lyrically, the record aims at a woman's heart by flattering and showing her she is unique. The single reached the number one position in some countries, including the United States and the United Kingdom, the third and fifth spot in Australia and New Zealand, respectively, and the top ten in Canada. It was certified triple platinum by the Recording Industry Association of America (RIAA) and once by Australian Recording Industry Association (ARIA) and Music Canada (MC).

The music video, directed by Ethan Lader, with animation done by George Rausch, and was filmed in Los Angeles. It prominently features the "paper cut-out technique", which takes multiple collages and taps them one over each other, in this case with various women. The video is interpolated with footage of the performers playing instruments along with Lawrence. The track has been covered by various recording artists, including "Weird Al" Yankovic. It was nominated for Record of the Year, Best Rap Song and Best Rap/Sung Collaboration at the 53rd Grammy Awards. The song has been performed live at The Ellen DeGeneres Show and at the 2010 MTV Video Music Awards. Both artists have promoted it during their respective tours.

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