"Our Song" is a song by English singer and songwriter Anne-Marie and Irish singer-songwriter Niall Horan. It was released on 21 May 2021 as the third single from the former's second studio album, Therapy (2021). Produced by TMS, "Our Song" was written by the two singers along with Philip Plested and the three members of TMS. The ballad's lyrics has the vocalists reminiscing about a past relationship.
In October 2020, Anne-Marie posted on Instagram that she was in a recording studio with Horan; the pair ended up writing three songs together. The song was announced on 13 May 2021, with the singers posting a 10-second clip on Twitter. Our Song was a commercial success it peaked at number 13 on the UK singles chart becoming Anne-Marie's ninth top 20 entry and Horan's third. Elsewhere it became a top ten hit on the Irish singles chart were it peaked at number 7.