John Frederick "Jack" Snow (15 August 1907 – 13 July 1956) was a writer, radio writer and scholar of the works of L. Frank Baum. Snow succeeded John R. Neill as Royal Historian of Oz, and he wrote two of The Famous Forty Oz Books: The Magical Mimics in Oz (1946) and The Shaggy Man of Oz (1949). He later wrote Who's Who in Oz (1954), a thorough guide to the Oz characters. His other Oz work is a short story, "A Murder in Oz," posthumously published in The Baum Bugle and collected with other horror stories he wrote in Spectral Snow,
The autumn 1988 issue of The Baum Bugle contains biographical and bibliographical information about Snow as well as critical analysis of his horror output.
Snow's 1955 short story "The Magic Sled" was reprinted in Oz-story Magazine No. 5 in 1999. (The tale refers to ryls, knooks, and the Forest of Burzee.) Snow's "Princess Chrystal and Prince Eolus," an excerpt from his early Tinkle and Tod, appeared in Oz-Story No. 6 in 2000.
Rumors have long maintained that Snow wrote or co-wrote a third Oz book, Over the Rainbow to Oz, though no manuscript and no firm evidence of the book's existence has ever emerged. The book in question supposedly features Baum's character Polychrome in a major role.