The Twilight Saga: New Moon (or simply New Moon) is a 2009 American romantic fantasy film directed by Chris Weitz from a screenplay by Melissa Rosenberg, based on the 2006 novel New Moon by Stephenie Meyer. The sequel to Twilight (2008), it is the second installment in The Twilight Saga film series. The film stars Kristen Stewart, Robert Pattinson, and Taylor Lautner, reprising their roles as Bella Swan, Edward Cullen, and Jacob Black, respectively. In the film, Bella meets and falls in love with Jacob, who is a werewolf, after Edward leaves her after the events of the first Twilight film, causing her to be in a love triangle and forces her to make a decision.

Summit Entertainment announced it had greenlit the film on November 22, 2008, following the early success of Twilight. Principal photography began on March 23, 2009, in Vancouver, Canada, and ended in Montepulciano, Italy on May 29.

The Twilight Saga: New Moon premiered in Los Angeles on November 16, 2009, and was theatrically released in the United States on November 20, by Summit Entertainment. The film received mixed to unfavorable reviews from critics, who criticized its story, pacing, Weitz' direction, its darker tone, and Lautner's performance, but praised its visual effects, Pattinson and Stewart's performances, and Desplat's musical score. Despite the reviews, it grossed $711 million worldwide, becoming the seventh-highest-grossing film of 2009. It set domestic box office records as the biggest midnight opening in the United States and Canada, grossing $26.3 million, which was superseded by its sequel, The Twilight Saga: Eclipse. This led to the highest single-day domestic gross on an opening day, with $72.7 million, until it was beaten by Harry Potter and the Deathly Hallows – Part 2 (2011). The film also became the widest independent release, playing in 4,024 theaters, until it was surpassed by The Twilight Saga: Eclipse. New Moon was released on DVD and Blu-ray Disc on March 20, 2010. As of July 2012, the film has grossed $184.9 million in North American DVD sales, selling more than 8.8 million units, four million of which were sold within its first weekend, beating Twilight's 3.8 million units sold in its first two days.

The film received three sequels, The Twilight Saga: Eclipse, The Twilight Saga: Breaking Dawn – Part 1, and The Twilight Saga: Breaking Dawn – Part 2, in 2010, 2011, and 2012, respectively.