Additionally, you may be looking for one of the adaptations that don't share the name:
In 1961, Crawley Films, (later Rankin/Bass Productions) produced a series of short cartoons, Tales Of The Wizard Of Oz, featuring Dorothy, the Wizard, the Witch, Socrates Scarecrow, Rusty Tinman, and Dandy Lion.
The 1986 Panmedia produced a Japanese animated series, known in English as The Wonderful Wizard of Oz, which was directly based on the books and only coincidentally resembled the 1939 MGM adaptation.
The 1999, Russian two-part animated television adaptation of L. Frank Baum, Adventures in the Emerald City: Silver Shoes. It’s mostly based on Baum but includes several elements from the "Magic Land" books. A two part sequel, Adventures in the Emerald City: Princess Ozma, adapted Baum’s Land of Oz.
A One Episode Wonder TV show pilot was made in 2002, Lost In Oz. This is not to be confused with a trilogy of books written by Joshua Dudley, also entitled Lost In Oz.
The 2007 Sci Fi Channel six hour, three-part miniseries Tin Man, a re-imagining and continuation of the classic story set years after the events of the original Wonderful Wizard of Oz.
The 2011 miniseries The Witches Of Oz by Leigh Scott of The Asylum fame, in which a modern-day Dorothy Gale discovers that her best-selling novels are in fact inspired by her own supressed memories of her adventures in Oz.
Many stage musicals are based on the Oz books, with the first ones written by Baum himself; later ones include:
A made-for-television biopic, The Dreamer of Oz: The L. Frank Baum Story, was made in 1990 and told the story of how the Oz books came to be. The cast included John Ritter as Baum and Rue McClanahan as his suffragette mother-in-law Matilda Gage. This movie is included as a bonus feature on the 2009 DVD and Blu-Ray releases of the 1939 adaptation.
Tom And Jerry and The Wizard of Oz, a 2011 Direct-to-Video animated feature, is a Twice Told Tale version of the 1939 film that adds the battling cat and mouse to the story. (The same company holds the rights to both the cartoon characters and the movie.)
Tales Of The Magic Land, a (very free) russian translation of the first book made by Alexander Melentyevich Volkov in 1939 that spun off into it's own book series.
An audio adaptation of "The Wonderful Wizard of Oz" by the Children's Museum of Los Angeles for the book's centennial, with Harry Anderson, Rene Auberjonois, Annette Bening, Phyllis Diller, Joanna Gleason, John Goodman, Robert Guillaume, Mark Hamill, Maurice La Marche, Michael Learned, Mako, Phil Proctor, Nestor Serrano and Michelle Trachtenberg, with an afterword by Ray Bradbury.