American writer who achieved great success with both her romantic novels and her books and columns of advice for homemakers.

Mary Hawes grew up in her hometown of Dennisville, Virginia, and from 1844 in nearby Richmond. She was well educated by private tutors and in her father's library. Writing under the pseudonym Marion Harland, she published her first novel, Alone (1854), privately in Richmond; two years later it appeared in a commercial edition that eventually sold more than 100,000 copies. Also in 1856 she married the Reverend Edward Payson Terhune, with whom she settled in Newark, New Jersey, in 1859.

While caring for the home and several children and taking part in parish activities, she continued to write. Subsequent novels, mostly antebellum plantation romances, included Moss-Side (1857), Nemesis (1860), At Last (1863), Sunnybank (1867), Ruby's Husband (1870), and My Little Love (1876). From 1876 to 1878 she and her husband traveled in Europe because of her health. They lived in Springfield, Massachusetts (1878–84), and in Brooklyn, New York, from 1884.

From the publication of the best-selling Common Sense in the Household (1871), Terhune enjoyed virtually a second career as a writer of books on homemaking and related topics. She wrote syndicated columns on women's affairs for the Philadelphia North American in 1900–10 and the Chicago Tribune in 1911–17. She also wrote several volumes of travel sketches, biography, and colonial history, and her autobiography, Marion Harland's Autobiography, appeared in 1910.