* The Hobbit (1977): This was a made-for-TV movie, starring Bilbo Baggins, played by Ian Holm. It was a shortened adaptation of the book.
* The Hobbit: An Unexpected Journey (2012): This was the first film in a trilogy, directed by Peter Jackson. It features Martin Freeman as Bilbo Baggins and a large ensemble cast.
* The Hobbit: The Desolation of Smaug (2013) and The Hobbit: The Battle of the Five Armies (2014): These were the second and third films in Peter Jackson's trilogy, completing the adaptation of The Hobbit.
So, depending on what you mean by "made into a movie", there are a few different answers!