In early November 2008, Summit announced that they had attained the rights to the remaining books in Stephenie Meyer's Twilight series: New Moon, Eclipse, and Breaking Dawn. In February 2009, Summit confirmed that they would begin working on The Twilight Saga: Eclipse. On the same day, it was announced that since New Moon director Chris Weitz would be in post-production for New Moon when The Twilight Saga: Eclipse began shooting, he would not be directing the third film. Instead, The Twilight Saga: Eclipse will be helmed by director David Slade, with Melissa Rosenberg returning as screenwriter.

In January 2010, an early draft of the film's script was leaked on the Internet. The script presumably belonged to star Jackson Rathbone, as his name was watermarked across each page.

Bryce Dallas Howard will be replacing Rachelle Lefevre as Victoria. Summit Entertainment attributed the

change to scheduling conflicts, and Lefevre responded that she was "stunned" and "greatly saddened" by the decision. Jodelle Ferland has been cast as the newly turned vampire, Bree. Other new cast members include Xavier Samuel as Riley, Jack Huston as Royce King II, Catalina Sandino Moreno as Maria,Julia Jones as Leah Clearwater, and Boo Boo Stewart as Seth Clearwater.

Principal photography began on August 17 at Vancouver Film Studios and ended on October 29, 2009. Howard Shore, who composed the scores for The Lord of the Rings trilogy, will compose the score for The Twilight Saga: Eclipse.

The score for The Twilight Saga: Eclipse will be composed by Howard Shore, who composed the scores for The Lord of the Rings trilogy. Muse will provide the lead single from the soundtrack.

The film is set for release on June 30, 2010.