"Watch Out for Lucy" is the B-side of the single "Promises" released by the British rock musician Eric Clapton in September 1978 of his studio album Backless.

The song's lyrics and music were written by Eric Clapton himself. The song features a fast chord progression in minor and major as well as diminished chords. The title is in the key of G major. Record producer Glyn Johns worked with Clapton during the recording sessions. The song was released in September 1978 as the B-Side of "Promises" on a 7" vinyl grammophone record, an international successful single of Clapton's 1978 studio album Backless. The single release charted nowhere else, other than in the United States, where it was additionally chosen by the Billboard magazine to chart on the Billboard Hot 100 singles chart. Because "Watch Out for Lucy" was not released as a separate single, there is no single cover for the release. With the A-side release, the song reached eight international single charts.

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