Mary Proctor FRAS FRMetS (1 April 1862 – 11 September 1957) was a British-American popularizer of astronomy.

Her father remarried in 1881 and her family immigrated to the United States settling in Saint Joseph, Missouri in 1882.

As she grew up, Proctor often assisted her father in his work, looking after his library and correcting proofs of his books before they went to publication.

After a well-received appearance at the World's Columbian Exposition 1893, she eventually developed a career as an astronomy lecturer.

Her book-length debut, Stories of Starland (1898), was adopted by the New York City Board of Education.