"Blue on Blue" is a popular song composed by Burt Bacharach with lyrics by Hal David, first recorded by Bobby Vinton in 1963. Vinton's single spent 13 weeks on the Billboard Hot 100 chart, peaking at No. 3 on July 6, 1963, while reaching No. 2 on Billboard's Middle-Road Singles chart. Vinton's single was a major hit in many other nations as well.

The success of "Blue on Blue" prompted Vinton to record an entire album of blue-themed songs, also titled Blue on Blue, which produced an even bigger hit in the No. 1 "Blue Velvet".

In 1990, when a reissue of "Blue Velvet" reached No. 2 in the UK and No. 3 in Ireland, "Blue on Blue" was on the B-side.

"Blue on Blue" has been recorded by Paul Anka (1963), Percy Faith (1964), Maureen McGovern (1991), and many others. Samples of a cover version of the song by Gals and Pals from 1966 were included Röyksopp's song 'So Easy'. "Blue on Blue" was also covered by Say Lou Lou in 2015 and used in commercials for the Swedish clothing company Gina Tricot. In 2017 Marc Almond released the song on his album of mainly cover songs called "Shadows & Reflections". Almond had previously sung the song at a Burt Bacharach evening at the London Palladium, which Bacharach performed in himself.

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