"On My Mind" is a song by English singer Ellie Goulding from her third studio album Delirium (2015). It was released as the album's lead single on 17 September 2015. It was written by Goulding, Max Martin, Savan Kotecha and Ilya Salmanzadeh. "On My Mind" is an electropop and R&B song whose instrumentation consists of scratchy guitars, trap drums, slapped beats and sharp, syncopated electronica. Lyrically, "On My Mind" talks about a one-night stand with someone the protagonist shouldn't be with, having a dichotomy between heart and head. Though firmly denied by Goulding, many critics considered it an answer song to Ed Sheeran's "Don't".

The song received positive reviews from music critics, who praised it for being a radio-friendly song, as well as Goulding's delivery, with one critic calling it one of her best singles to date. Commercially, "On My Mind" became another top-ten hit in the United Kingdom, as well as in Australia and other five territories, while reaching the top 20 in other seven countries. In the United States, it reached number 13 on the Billboard Hot 100. Its Western-themed music video was inspired by the film Thelma & Louise and was directed by Emil Nava. It premiered on 21 September 2015, and it shows Goulding in a revenge story in Las Vegas.

Originally, "On My Mind" was planned to be released in the first quarter of 2015, with British radio network Capital FM announcing that Goulding claimed that hopefully the single was set to be release around March 2015. However, the release was postponed due to the commercial success of "Love Me like You Do", released on 7 January 2015, as the second single of the soundtrack of the film Fifty Shades of Grey. On 6 August 2015, during iHeartMedia's annual music summit, it was revealed that Goulding's new single was called "On My Mind" and was set to be released "soon". On 14 September 2015, Goulding teased her fans on Instagram by posting a "mysterious, semi-topless gif" with the date 17 September", announcing the song's release date. A day later, she posted a 15-second clip of the song. It was described as a "more commercial pop sound" for the singer, who worked with the same team of writers of her successful previous single "Love Me like You Do". Goulding described its sound as "[...] very different for me. But I think it’s a good different." On 17 September 2015, "On My Mind" was released to digital download by Polydor Records as the album's lead-single. A day later, the song was added to Italian radio, and it was serviced to US contemporary hit radio on 22 September 2015.

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