A New Day... was the first concert residency performed by Canadian singer Celine Dion in The Colosseum at Caesars Palace in Las Vegas, Nevada, United States. It was created and directed by Franco Dragone to support her seventh English-language and eighteenth studio album A New Day Has Come (2002). The show premiered on 25 March 2003 and ended on 15 December 2007.

A concert residency is a series of concerts, similar to a concert tour, but only performed at one location. Pollstar Awards defined residency as a run of 10 or more shows at a single venue. An artist who performs on a concert residency is called a resident performer. Concert residencies have been the staple of the Las Vegas Strip for decades, pioneered by singer-pianist Liberace in the 1940s and Frank Sinatra with the Rat Pack in the 1950s.