"Runaway (U & I)" is a song by Swedish electronic music duo Galantis. It was released on 5 October 2014 as the lead single from their debut studio album Pharmacy (2015). The song features Julia Karlsson performing the chorus and Cathy Dennis performing two verses on heavily processed and uncredited vocals.

In early 2015 it achieved chart success on the Australian Singles Chart reaching number four, and on the New Zealand Singles Chart, where it peaked at number six. It also debuted at number four on the UK Singles Chart and has since sold over 600,000 units to date, giving it a Platinum certification by the British Phonographic Industry.

The song was written by Anton Rundberg, Julia Karlsson, Linus Eklöw, Christian Karlsson, Jimmy Koitzsch and Cathy Dennis. Billboard ranked the song at number five on its "The 10 Best Electronic/Dance Songs of 2014" list. "Runaway (U & I)" received a nomination for Best Dance Recording at the 58th Grammy Awards.

The song is written in B-flat minor at a tempo of 126 beats per minute.

A music video to accompany the release of "Runaway (U & I)" was first uploaded onto YouTube on 19 January 2015.

"Runaway (U & I)" has been remixed by several high-profile producers. Dillon Francis, DJ Mustard, KSHMR, Kaskade and Quintino are among the artists who have remixed the track. Dillon Francis' version in particular has grabbed the highest praise with a trap version of the song. An additional remix by electronic artists Svidden and Jarly was featured in the film Paper Towns.

The song was sampled in the Shades remixed version of Canon's "Grow Up" featuring Tragic Hero,

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