Robert R. Pattrick (21 November 1926 – 17 August 1960) was a twentieth-century writer on Oz and L. Frank Baum. His book Unexplored Territory in Oz was published by The International Wizard of Oz Club in 1963.

Pattrick's sister Elizabeth Pattrick Mackenzie contributed a brief Foreword to Unexplored Territory, in which she noted her brother's interests in "children's stories, the comics, science fiction, and Sherlock Holmes." He was born in Kansas City, Missouri, and educated in California; he was a library researcher who "wrote essays, non-fiction articles, and children's literature." He died at the young age of 33, "as a result...of having scarlet fever in his childhood."

Pattrick's essay on "Oz Geography" was printed serially in four issues of The Baum Bugle in 1959 and 1960. His article on "The Flag of Oz" appeared in the Bugle in October 1958. His story "Glinda and the Red Jinn" is in the 1977 issue of Oziana.

Two of his pieces on Sherlock Holmes, "Ponderings of a Politician" and "A Sherlockian Zoo" (the latter co-written with Adelaide Ewing) are found in the 1965 collection West by One and by One, edited by Poul Anderson. Another, "The Case of the Superfluous Landlady," appeared in the Baker Street Journal in October 1953.

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