"Boom Bang-a-Bang" is a song recorded by Scottish singer Lulu. The song was written by Alan Moorhouse and Peter Warne. It was the British winning entry at the Eurovision Song Contest 1969, held in Madrid. It was the joint winner with three other entries: Salomé singing "Vivo cantando" for Spain, Lenny Kuhr singing "De troubadour" for the Netherlands, and Frida Boccara singing "Un jour, un enfant" for France.

Lyrically, the song is a plea from the singer to her lover to "cuddle me tight". She then goes on to explain that "my heart goes boom bang-a-bang boom bang-a-bang when you are near", complete with appropriate musical accompaniment. The single made No. 2 in the UK Singles Chart and was a major hit throughout Europe.

Over two decades after its first release, the song was included on a blacklist of banned songs issued by the BBC during the 1991 Gulf War.

Boom Bang-A-Bang was also the name of a BBC One 1-hour programme made to celebrate fifty years of the Eurovision Song Contest in 2006. Broadcast during that year's Eurovision week, the special was hosted by Sir Terry Wogan and featured archive footage and highlights of past contests, along with a performance of that year's UK entry by Daz Sampson.

The song is the theme tune for the BBC Three sitcom Him & Her (2010).