"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 criticized for Duffy's vocal style. Some thought that it "is possibly the weakest of the new tunes" from its parent album.

Failing to meet the popularity of her previous singles, "Well, Well, Well" peaked at number 41 on the UK Singles Chart and number 37 on the European Hot 100 Singles chart. Commercially, it is her worst performing single to date, although it proved to be a moderate success in mainland Europe, reaching the top twenty in Finland, Belgium and Switzerland. The song's accompanying music video portrayed Duffy backed with male dancers in several scenes around the city of Oxford, England. The single was promoted extensively as part of a campaign of "major TV moments", taking in the UK, the United States as well as seven countries around Europe in 2010 and 2011. At 2:45, it is the shortest of all Duffy's singles.

"Well, Well, Well" was recorded at the British Grove Studios in London in 2010, as part of recording sessions for Endlessly that took place throughout the year of 2010. Duffy said that she "want[ed] to make people move [dance] [...] "I played so many live shows that I wanted to feel we could have a really uptempo gig. So for me, I've done nothing, but possibly improve, and really know where it is I want to put myself. I recorded this with lots of different people and a few different locations." In an interview with Stylist Magazine, she explained that she was reluctant to follow trends for the recording and writing of Endlessly and "Well, Well, Well," saying "I'm a little less shy of saying the things I want to say now, and more clear on what it is that I want to achieve [...] I didn't want to repeat what I did before but, equally, I don't want to stray too much away from it – this record's infused with my growth, but I'm also standing by who I am and refusing to be swayed by trends."

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