"Outside" is a song by Scottish DJ and record producer Calvin Harris from his fourth studio album, Motion (2014). The song features English singer Ellie Goulding and was released on 20 October 2014 as the fourth single from the album. It marks the second collaboration between Harris and Goulding, following the internationally successful single "I Need Your Love" (2013). "Outside" is included on the deluxe edition of Goulding's third studio album, Delirium.

With a tempo of 128 beats per minute, "Outside" is composed in the key of D minor. It follows a chord progression of B♭-Gm-Dm-C.

The song received very positive reviews from music critics, calling it a great follow-up of their previous collaboration, and noting it as a highlight of the album. Brent Faulkner of PopMatters praised the song as "one of Motion's crème de la crème records" and wrote that it "latches from a first listen giving the set arguably its strongest pop hit." Kyle Anderson of Entertainment Weekly commented that on "Outside", Harris "finds the perfect balance between [Goulding's] vulnerable warble and the warping synths underneath".Idolator's Robbie Daw found the song to be "just as pleasant, if not slightly more so, than Calvin and Ellie's previous outing together, 2012's 'I Need Your Love.' It's good to hear that there's still quite a bit of musical magic when these two hit the studio together."

Carolyn Menyes of Music Times stated, "There's something that works so well about Harris' string effect synth beats and Goulding's whispered ethereal voice. We've heard it before in 'I Need Your Love' and it's back here again in full force for yet another magical combination." Heather Phares of AllMusic felt that the track "doesn't quite recapture the magic of [Harris and Goulding's] previous work but does make the most of her deceptively powerful soprano, this time in a more upbeat setting."Slant Magazine's James Rainis opined that "[t]he most notable characteristic of 'Outside' [...] is that the hook's cadence is exactly the same as the Carly Rae Jepsen/Owl City song 'Good Time,' but it lacks that song's cutesy charm." Chase Hunt of AXS viewed the song as "a decent pairing but an expected outcome."

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