"Don't You Worry Child" is the sixth and final single released by Swedish electronic music group Swedish House Mafia. It is the last single from their second and final studio album Until Now, featuring vocals from Swedish singer John Martin. In the United States, it is the act's second number-one single on Billboard's Dance/Mix Show Airplay chart, following "Save the World". It received a Grammy nomination for Best Dance Recording in the 2013 Grammy Awards, as did its predecessor, "Save the World", the previous year. The song is written in the key of B minor.

The song was announced during the Swedish House Mafia's tour of Australia while they played at Future Music Festival 2012. They say it was made from the inspiration they took from the beauty of Australia. The title "Don't You Worry Child" was mentioned a few times, with hints from the group members themselves on their Twitter pages. When it was announced that the tour the Swedish House Mafia was about to set on would be their last, a farewell single was also announced – "Don't You Worry Child" being that single. The song had its live debut at the Swedish House Mafia's Milton Keynes Bowl concert and its radio debut on Pete Tong's BBC Radio 1 show on 10 August 2012. The song contains a sample from the song "Be My World" by Italian dance act Milky.

The song was included on their tour One Last Tour, which ended in Miami where they parted ways forever.

In the United Kingdom, "Don't You Worry Child" made its debut at number one with first week sales of 135,000 copies. It sold 632,000 copies in the United Kingdom in 2012, the 13th best-selling single of that year.

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