"Runnin' (Lose It All)" is a song by British record producer Naughty Boy, featuring American recording artist Beyoncé and English singer Arrow Benjamin. It was released online on 18 September 2015 as the first single from Naughty Boy's second studio album. Upon its release, the song received positive reviews from music critics, mostly praising the song's arrangements and Beyoncé's vocals. A music video was directed by Charlie Robins and it depicted a woman and a man chasing each other underwater.

On 16 September 2015, Naughty Boy announced that he would release a song titled "Runnin' (Lose It All)" featuring Beyoncé and Arrow Benjamin. On the same date he shared the artwork for the single, its lyrics, a 15-second sound snippet along with a video through his Instagram account and began a countdown until its online release. The video consisted of two humans floating alone, submerged underwater. The following day, on 17 September 2015, "Runnin'" premiered online. It was available for digital download on the iTunes Store on 18 September 2015. According to Digital Spy, a version of the song lacking Beyoncé's vocals leaked online in August 2015.

"Runnin' (Lose It All)" is a power ballad featuring elements of drum and bass. It was noted by Elle Hunt of The Guardian to be established in the genre of British dance music. The song's composition consists of melancholy piano keys. It opens with Beyoncé singing the first verse over a piano track with lyrics such as "Nothing else matters now; you're not here. So where are you? I've been calling you, [I'm] missing you". Following the hook, the song's tempo increases and "Runnin'" continues with a garage break afterwards. During the chorus, Beyoncé sings about how she will stop running from herself as she repeats the lines "Ain't running from myself no more". The second verse is sung by Arrow Benjamin and the last chorus is sung as a duet between both singers. Eric Renner Brown from Entertainment Weekly further found "typically soulful Beyoncé lyrics". Elle Hunt of The Guardian compared the song with Beyoncé's own "Halo" and "Haunted" as well as Naughty Boy's previous collaborations with singer Emeli Sandé.

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