"Well, Well, Well" is a song by Welsh singer Duffy, from her second studio album, Endlessly (2010). It was released as the lead and only single from the album worldwide, beginning on 19 October 2010 in the UK. As with the rest of the album, the song was both written and produced by Duffy and Albert Hammond, with Stuart Price providing co-production. It is an up-tempo pop song in which Duffy questions her lover's accusations, with Duffy calling it a song about "desire for freedom" within a relationship. Marking a departure from the soul sound of her debut album, Rockferry (2008), the song received mixed reviews from critics; being both praised and criticised for Duffy's vocal style. Some thought that it "is possibly the weakest of the new tunes" from its parent album.

Endlessly is the second studio album by Welsh singer Duffy. It was released in the United Kingdom on 26 November 2010 by A&M Records and in the United States on 7 December 2010 by Mercury Records. Duffy worked almost exclusively with Albert Hammond Snr. on the album, with all but one of the album's songs being written by Hammond and Duffy. Four of the songs received additional or co-production by Stuart Price. Music is also provided by The Roots and Questlove. Musically, the album follows the soul stylings of her first album Rockferry (2008), although Duffy drew inspiration from a variety of other genres, including disco and soft rock, and was compared to pop singers such as Kylie Minogue. It has been said that Duffy wrote the album in three weeks, although recording sessions lasted between 2009 and 2010.