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The Western is a film genre that dates from The Great Train Robbery (1903) and continues to the present day.

More information on the genre: Wikipedia | Encyclopaedia Britannica.

50 Westerns from the Fifties
A blog devoted to Western films made during the 1950s.

100 Greatest Westerns
Annotated list on the AMC (American Movie Classics) Filmsite. This site also includes a lengthy introductory article on the history of the western film.

Internet Movie Database
Information on hundreds of western films and television programs, including cast, crew, production details, and synopses.

List of Western Films
Wikipedia’s “list of notable Western films and TV series, ordered by year and decade of release.”

 Open Culture: Free Westerns
A list of western films available for viewing online at no charge.

Top 100 Western Movies
List of top westerns at Rotten Tomatoes website.