"Secret Love Song" is a song recorded by British girl group Little Mix for their third studio album, Get Weird (2015). It features guest vocals from American singer Jason Derulo, who co-wrote the song with Jez Ashurst, Emma Rohan, and Tich. It was produced by Jayson DeZuzio. The group's cover of Derulo's 2015 single "Want to Want Me" inspired him to collaborate with them. "Secret Love Song" is a slow ballad comprising pounding bass and melancholic strings. The lyrics discuss unrequited and forbidden love, while Derulo's verse details his personal experience of having an affair.

The song was announced as the third single from Get Weird in Ireland and the UK. It was met with mixed reviews from music critics, who lauded the group's vocal performance, but criticised Derulo's feature and the track's originality. "Secret Love Song" has reached number six on the UK Singles Chart. An accompanying music video was directed by Frank Borin and filmed in London near Tower Bridge.

In July 2015, Little Mix member Jesy Nelson said that the group's third studio album, Get Weird, would have a song "that is possibly going to be a single that we've never done anything like before". Group member Perrie Edwards added: "And it may or may not have a feature...." The track, "Secret Love Song", was written by Jez Ashurst, Emma Rohan and Tich, and produced by Jayson DeZuzio. The group then sent the song to Jason Derulo who positively reacted to it, writing his own verse. Recording took place at Poinsettia Place in Los Angeles and at Blue Box Studios in London.

Derulo's decision to collaborate with the group was influenced by a string of events; Hit 30 presenters Angus O'Loughlin and Ash London played him the group's cover of his 2015 single "Want to Want Me" for BBC Radio 1's Live Lounge in July 2015. He reacted: "I was into that, man", and said he understood why the cover became a viral video. However, Derulo was unfamiliar with the group's music at the time and had to "research" their discography which he ultimately became fond of. Group member Jade Thirlwall felt the song's slow tempo was "a nice change" for Derulo and "[showed] his voice off a lot". A solo sequel of the song, "Secret Love Song Pt. II", was included on the deluxe version of Get Weird.

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