"On the Horizon" is a song released by British singer-songwriter Melanie C. It was written by her along with Rick Nowels, Gregg Alexander, and produced by Nowels and Alexander for her second studio album Reason (2003). Selected as the album's second single, the song reached number 14 in the UK Singles Chart, selling 8,000 copies in its first week. The single went on to sell more than 22,000 copies, and over 200,000 copies worldwide. Melanie C performed the song during the Reason Tour.

The music video for "Reason" was directed by Howard Greenhalgh and filmed in and around Benalmadena, in Southern Spain on 9-10 April 2003. Melanie is in Spain driving around to find duplicated images of herself that are frozen in various scenes. When she finds them, Melanie gets inside of them in order to give the scenes movement. The duplicated Melanies are at a Car Wash, playing basketball, and jumping into the water with a man. At the end of the video, Melanie and her duplicated image leave together in the car.

These are the formats and track listings of major single releases of "On the Horizon".

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