Ruth Edna Kelley (8 April 1893 – 4 March 1982) was an American librarian and author.
She is chiefly remembered for The Book of Hallowe'en (1919), the first book-length history of the holiday.
Kelley was born in Massachusetts, the only child of Charles F.
Kelley, a carpenter, and his wife Mary.
She grew up in Lynn, Massachusetts, and received a master of arts degree.
The Book of Hallowe'en was Kelly's first book.
Her second book, A Life of Their Own (1947), dealt with immortality and spirituality.
Kelley died in Marblehead, Massachusetts at the age of 88.