This Is It was a planned series of 50 concerts by Michael Jackson to be held at The O2 arena in London. They were scheduled to begin in July 2009 and continue through March 2010. Less than three weeks before the first show was due to begin and with all concerts being sold out, Jackson died after suffering cardiac arrest.

Jackson officially announced the concerts at a press conference held inside The O2 arena. AEG Live, the concert promoters, released a promotional video that took up an entire commercial break, setting a record for ITV. The shows were to be Jackson's first major series of concerts since the HIStory World Tour finished in 1997, and had been cited as one of the year's most important musical events. Over one million people would have attended in total. Randy Phillips, president and chief executive of AEG Live, stated that the first 10 dates alone would have earned the singer approximately £50 million. Originally only 10 concerts were announced, however public demand resulted in a 50 date sold out residency. Ticket sales broke several records and AEG Live stated that Jackson could have sold more dates. Jackson's album sales increased following the announcement.

In preparation for the concert series, the pop singer had been collaborating with numerous high profile figures, such as fashion designer Christian Audigier, choreographer Kenny Ortega and bodybuilder Lou Ferrigno. Prior to Jackson's death, Allgood Entertainment had planned to sue the musician for $40 million, claiming that he had breached a contract with them.

In light of Jackson's passing, AEG Live offered either full refunds to all ticket holders or a special souvenir ticket designed by the entertainer. Columbia Pictures acquired the footage of the show rehearsals and made a concert film entitled Michael Jackson's This Is It.