"Jealous" is a song performed by American recording artist Nick Jonas for his eponymous second studio album. It was released on September 8, 2014, by Island Records as the second single from the record. It was written by Jonas, Sir Nolan, Simon Wilcox, and the song was produced later by Sir Nolan. "Jealous" has peaked at No. 7 on the US Billboard Hot 100, consequently becoming Jonas's highest charting single and highest selling single with 3 million copies sold in the United States to date. The single has also peaked at No. 1 on the US Hot Dance Club Songs chart "Jealous" has also peaked at No. 2 on US Billboard Mainstream Top 40 for five weeks, and also at No. 10 on the Billboard Canadian Hot 100. "Jealous" was also a top 20 hit in Australia, reaching No. 15 on the ARIA Charts, and also in Ireland, where it peaked at No. 28. It peaked at No. 8 in New Zealand. The song had its biggest success in the United Kingdom, where it peaked at No. 2 on the UK Singles Chart.

The song's music video was shot by director Peter Tunney, a frequent collaborator of Jonas'. The video received positive reviews and was praised for inspirational quotes in the background. The singer performed "Jealous" on television shows such as Late Night with Seth Meyers, Today, The Kidd Kraddick Morning Show, VH1 Big Morning Buzz Live, VH1 Artist to Watch, 2014 MTV Europe Music Awards kick-off special and The Ellen DeGeneres Show and included it on the Nick Jonas Live Tour set list. The official remix of "Jealous" featured singer-songwriter Tinashe and was released on November 5, 2014. The song was also covered by The Voice season seven contestant Chris Jamison. The Uncensored Version was uploaded to his Official YouTube account but is not present on the Explicit version of the album. The song is also included as a bonus track on the UK deluxe version of Last Year Was Complicated, along with "Chains" and "Levels".

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