"Tonight" is the third single by the American pop band Jonas Brothers from their third studio album, A Little Bit Longer. Fueled by digital downloads, the song debuted and peaked at number eight on the Billboard Hot 100 songs chart on August 7, 2008, the group's second (and final) top ten single and second highest-charting single to date (after their top five single "Burnin' Up"). The song also reached the top twenty in Canada.

The song's official single release was confirmed at the 36th Annual American Music Awards. They also performed the song later that night during the show. They have confirmed that filming for the music video is complete and it will be sent to mainstream radio in early January. The song was released on January 4, 2009 and the music video was released on January 19, 2009.

According to the band's iTunes podcast, Jonas Brothers Countdown to A Little Bit Longer, Nick Jonas stated that:

"This song is about being in a relationship with somebody and getting into arguments that will not work out that night. It's also one of my favorite songs on the album."

USA Today's Ken Barnes called the song "pandemically infectious". Glenn Gamboa of Newsday likened the song to the music of Fall Out Boy, calling it "sleek, adrenalized good-time pop".

The music video for "Tonight," was directed by Bruce Hendricks, director of Walt Disney Studios' Jonas Brothers: The 3D Concert Experience. It contains scenes from the 3D movie, including concert and backstage footage along with interaction with fans.

"Tonight" was released on July 29, 2008 on the iTunes Store and soon reached number one on the iTunes Top Songs chart. It was the third song from A Little Bit Longer that reached number one on that chart.

With over 131,000 downloads in its initial week of release, "Tonight" was the highest debuting song on the Billboard Hot 100 in the issue dated August 16, 2008, coming in at number eight, without an official single release. The Jonas Brothers became the first act to have two songs debut in the top ten on the chart in the same calendar year since Madonna achieved the feat in 1998. The following week, "Tonight" fell to number 74. It premiered during the Kids Inaugural: We Are The Future on Disney Channel on January 19, 2009.

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