Give a stream of consciousness and then the final answer. Mary William Ethelbert Appleton "Billie" Burke (August 7, 1884 -- May 14, 1970) was an American actress who was famous on Broadway, in early silent film, and subsequently in sound film. She is best known to modern audiences as Glinda the Good Witch of the North in the movie musical The Wizard of Oz (1939), which starred Judy Garland.

Answer this question: who played glinda the good witch in the wizard of oz?
The relevant information is: She is best known to modern audiences as Glinda the Good Witch of the North in the movie musical The Wizard of Oz (1939), which starred Judy Garland.
So, the final answer is `` Billie '' Burke.