Windfall is an American serial drama television series about a group of people in an unnamed small city who win almost $400 million in a lottery. The series was created by Laurie McCarthy and Gwendolyn M. Parker and premiered on June 8, 2006, on NBC, taking the time slot occupied by ER during the rest of the year.

On August 31, 2006, NBC announced the show's cancellation by stating on its website that the episode that night would be the series finale. NBC also gave local affiliates the option of showing pre-season football instead and showing the final episode at each affiliates discretion. Many affiliates took them up on this, planning to show it either much later that night or at other odd days/times during the Labor Day weekend (for example, WNBC-TV in New York planned to show the episode at 12:30pm on September 3, 2006).In the United Kingdom and Middle East the show has been picked up by Five Life and Showtime Arabia respectively. It is also shown in Ireland on the channel 3e weekdays at 3pm.