L. Frank Baum
Source(s):
http://en.wikipedia.org/wiki/Wizard_(Oz)

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The movie or the book? The book was written by L. Frank Baum and the film was co-written by Noel Langley, Florence Ryerson and Edgar Allan Woolf (interesting name).
Source(s):
http://www.imdb.com/title/tt0032138/fullcredits#writers

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If you mean the book, it's L. Frank Baum, and it was part of a whole series.  He also wrote the Broadway play (1902), but had to make bunches of changes due to his contract
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Wait a second, you're a greenbelt not a newbie. So what's with the elementary question that you could look up yourself? There must be a trick to it.

Since it is listed in the movie category, maybe you want to see if anyone lists the whole lot of folks who contributed to the screenplay:
Writing credits:
Noel Langley (screenplay) and
Florence Ryerson (screenplay) and
Edgar Allan Woolf (screenplay)

Noel Langley (adaptation)

L. Frank Baum (novel "The Wonderful Wizard of Oz")

Irving Brecher uncredited
William H. Cannon uncredited
Herbert Fields uncredited
Arthur Freed uncredited
Jack Haley additional dialogue (uncredited)
E.Y. Harburg uncredited
Samuel Hoffenstein uncredited
Bert Lahr additional dialogue (uncredited)
John Lee Mahin uncredited
Herman J. Mankiewicz uncredited
Jack Mintz uncredited
Sid Silvers uncredited

Source(s):
http://www.imdb.com/title/tt0032138/fullcredits#writers

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