"Lucky Day" is a song by British recording artist Nicola Roberts. It was released on September 18, 2011 under label Polydor Records as the second single from Roberts debut album Cinderella's Eyes. The song was written by Roberts and was produced by Canadian electropop group Dragonette. "Lucky Day" is an upbeat pop song featuring synths; lyrically the song talks of a boy not succumbing to advances—but doing so eventually—although Roberts stated the concept relates to all aspects of life and luckiness. Roberts' vocals have been compared to that of Liza Minnelli and the track has been compared to the music of David Guetta and the Katy Perry track "Last Friday Night (T.G.I.F.)".

The song was well received by contemporary critics, who noted the success of the Dragonette-production, in addition to reviewers who called it a good follow-up single to her debut due to the successful pop themes and potential of the track. Commercially the track debuted at number 40 in both the UK Singles Chart and the Scottish Singles Chart. A music video directed by Stephen Agnes was released; the video was filmed in the East Village of New York City and presented Roberts walking down various streets in the city with special effects added to her movements. During the shoot, weather conditions made it uncomfortable for filming, although this was not reflected in critical opinion. The video's simplicity, as well as the dress she wore in the video, gained mixed responses from critics.

Released after the moderate commercial success of "Beat of My Drum", it was confirmed that "Lucky Day" would be released as the second single from Roberts debut album, Cinderella's Eyes, with a release date of September 18, 2011. Roberts unveiled the track as the second single on her website, declaring "it's very different to Beat Of My Drum" because it was important to show multiple sides to the Cinderella's Eyes album. Roberts chose the track as the second single in an effort to "show that the album is quite diverse", and although the release came after the summer period she found it to be a "summer track", and found that the reaction from her label, the media and her fans had been positive.

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