"Trouble" is a song by Australian rapper Iggy Azalea featuring American recording artist Jennifer Hudson, taken from Reclassified, the former's 2014 reissue of her debut studio album. The song was produced by The Invisible Men and Salt Wives.

In December 2014, Azalea revealed the track would be the official second promotional track off the reissue, although no specific date for the single to be released digitally or serviced to radios was reported. It was then announced that the song would be impacting mainstream radio stations in the US on 24 February 2015, with an accompanying music video also shot earlier that month. The video premiered on 27 February 2015 on Vevo.

The song achieved commercial success, reaching the top ten in Australia and the UK, top twenty in Ireland, as well as charting in other major international territories including the US, Canada and Belgium. It was nominated for Song of the Year at the 2015 ARIA Music Awards.

On 4 September 2014, Azalea announced that she would be reissuing her debut studio album The New Classic. In October 2014, details of the reissue started to be revealed and that it would be officially released in November. During an interview with Radio.com backstage at the CBS Radio We Can Survive concert at the Hollywood Bowl on 24 October 2014, Azalea talked about her upcoming re-release Reclassified. With the expanded version of the album, Azalea got to team up with Jennifer Hudson for a second time, after being featured on Hudson's song "He Ain't Goin' Nowhere" off her third studio album JHUD, "It kind of has a doo-wop feel," Azalea said, also mentioning her desire to do something different from her musical style and being excited about performing it; "It's kind of something you'd picture Aretha Franklin singing."

In December 2014, Azalea shared through her Twitter account that she was preparing her next single, "Trouble," as the second promotional track off the reissue, while also announcing plans to shoot a music video for the previous single "Beg for It" had been scrapped. After being questioned by fans about the decision to make the track a single, Azalea answered by noting it was related to radio formats and audience testing explaining, “People need to realize they ‘test’ the songs with people and give them scores. That's how it works, they pick based on what scores.”

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