Harriet Mann Miller (pen names Olive Thorne, Olive Thorne Miller, 25 June 1831 - 25 December 1918) was an American author, naturalist, and ornithologist. She wrote stories for leading magazines, and in her later years, devoted herself to the study of birds. Her first articles appeared under the pen-name "Olive Thorne" before writing under the signature of "Olive Thorne Miller". Her books include: Little Folks in Feathers and Fur (1879), Queer Pets at Marcy's (1880), Little People of Asia (1882), Birds' Ways (1885), In Nesting Time (1888), and also a serial story entitled, "Nimpo's Troubles", published in the St. Nicholas Magazine, in 1874.