For the United States from the Internet Movie Database. Other countries also available.

Schedule for major releases.

Movie release schedule listed by seasons, accompanied by publicity shots and synopses.

Listing of films coming to theaters and video.

Search by title, by genre, or by stage of development. This is one of "Roger Ebert's Top 20 Movie Sites".

List of films that open in the US in the next month.

From Pete's Movie Page.

Film release schedule and weekend box office data from Eric Carter.

Weekly release schedules.

Listings of upcoming theater releases by date, with links to trailers and video clips.