XX is a compilation by Great Big Sea to celebrate the band's 20th anniversary. It is the group's final album to date, as well as their last recording to feature Séan McCann. It was released as a two-disc CD album, and also in a Deluxe Edition which includes a third CD plus a DVD with an hour-long documentary "Meet Great Big Sea" and other goodies.

Great Big Sea was a Canadian folk rock band from Newfoundland and Labrador, best known for performing energetic rock interpretations of traditional Newfoundland folk songs including sea shanties, which draw from the island's 500-year Irish, Scottish, and Cornish heritage. The band was very successful in Canada, with eleven of their albums being certified Gold in the country, including four being certified Platinum and two achieving multi-platinum certifications. Between 1996 and 2016, Great Big Sea was the sixteenth best-selling Canadian artist in Canada and the sixth best-selling Canadian band in Canada.