"Oh No" is a song by British rock band Bring Me the Horizon. Produced by keyboardist Jordan Fish and vocalist Oliver Sykes, it was featured on the band's 2015 fifth studio album That's the Spirit, when it reached number 166 on the UK Singles Chart and number ten on the UK Rock & Metal Singles Chart. It was later released as the seventh single from the album on 18 November 2016.

"Oh No" has been described as one of the "softer" tracks on That's the Spirit in reviews of the album. In a pre-release track-by-track feature on the album, Rock Sound writer Andy Biddulph outlined that the song features vocalist Oliver Sykes "singing mournfully ... while the band around him build to a lush, textured chorus", adding that "there's almost no guitar here, but the high-tempo drumming, electronics and hard-hitting subject matter make this band sound heavier than ever".The Guardian writer Lanre Bakare categorised the song as "more dance than nu-metal", noting that it also features a "trance breakdown". The section in question appears near the end of the song and is characterised by the presence of a brass section with a saxophone solo on top. Bradley Zorgdrager of Exclaim! compared the track's style to the work of "post-reunion Fall Out Boy". Upon the release of the song's music video, "Oh No" was dubbed as pop rock by the Ultimate Guitar Archive.

In a track-by-track commentary of That's the Spirit for Spotify, Sykes explained that "'Oh No' is meant to be like this anti-dance song ... it's all about people who live for the weekend and people that's [sic] my age, 30 something or older ... still trying to live like [they're] 18 or 21. They're trying hard to have fun they don't even realise that they're probably not even having any". The song also features references to drug addiction. The "anti-dance" lyrics are intended to juxtapose the dance-heavy style of the song, which the vocalist added is meant to sound "like something you'd hear in a club". Speaking about the brass section and saxophone solo, Sykes explained that he "wanted this final part of the album to feel like when the lights come on at a club or a bar and you get that slightly shitty song feeling. It's like all good things must come to an end."

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