The Internet Movie Database (IMDb) and Fandango are a couple of good resources for locating the cast lists for "The Hobbit" movies. "The Hobbit" movies are a trilogy of films directed by Peter Jackson and released between 2012 and 2014.
The three films that make up "The Hobbit" series are "An Unexpected Journey," released in 2012; "The Desolation of Smaug," released in 2013; and "The Battle of the Five Armies," released in 2014. In addition to directing, Jackson also co-wrote the screenplay and was one of the three film's producers.
The movies are based on "The Hobbit," a novel written by J.R.R. Tolkien and released in 1937. "The Hobbit" series of films serve as a prequel to "The Lord of the Rings" trilogy that was also directed by Jackson.