"It Must Be Love" is a song written and originally recorded and released in 1971 by English singer Labi Siffre on his 1972 album Crying Laughing Loving Lying. It was also recorded by ska/pop band Madness in 1981.

Claudius Afolabi Siffre, better known as Labi Siffre, is a British singer, songwriter and poet. Siffre released six albums between 1970 and 1975, and four between 1988 and 1998. His best known compositions include "It Must Be Love", which reached number 14 on the UK Singles Chart in 1971, "Crying Laughing Loving Lying", and "(Something Inside) So Strong"—an anti-apartheid song inspired by a television documentary in which white soldiers in South Africa were filmed shooting at black civilians in the street—which hit number 4 on the UK chart. The latter song won Siffre the Ivor Novello Award for Best Song Musically and Lyrically from the British Academy of Songwriters, Composers and Authors, and it has been used in Amnesty International campaigns.