Harry Rimmer (1890–1952) was an American evangelist and creationist. He is most prominent as a defender of creationism in the United States, a fundamentalist leader and writer of anti-evolution publications.

Harry Sinclair Drago was an American writer of screenplays and Westerns. He also wrote under the names Stewart Cross, Kirk Deming, Will Ermine, Bliss Lomax, J. Wesley Putnam and Grant Sinclair.

Harry Stephen Keeler was a prolific but little-known American fiction writer, who developed a cult following for his eccentric mysteries. He also wrote science fiction.

Harry Thurston Peck was an American classical scholar, author, editor, historian and critic.

Hartley Burr Alexander, PhD (1873–1939), was an American philosopher, writer, educator, scholar, poet, and iconographer.

Harvey Fergusson (January 28, 1890 – August 27, 1971) was an American writer.

Harvey Newcomb (September 2, 1803 – August 30, 1863) was an American clergyman and writer.

Hastings Rashdall was an English philosopher, theologian, historian, and Anglican priest. He expounded a theory known as ideal utilitarianism, and he was a major historian of the universities of the Middle Ages.

Hattie Tyng Griswold was an American author of the long nineteenth century. She wrote many stories, sketches, and poems. Born in Boston, Griswold relocated with her family to Columbus, Wisconsin, in 1850, where, in the course of time, she married, raised her children, and did much of her work as an author. Her home was a meeting place of many of the notable people of the day, for she had an extensive personal acquaintance with literary and other celebrities. The books by which she is best-known are: Apple Blossoms, Waiting on Destiny, Lucile and Her Friends, and The Home Life of Great Authors. "Under the Daisies" is one of her best-known poems. She wrote stories for the Home Journal of New York, The Knickerbocker, Madison State Journal, Old and New, The Christian Register, and Boston Commonwealth. Griswold served as president of the Woman's Christian Temperance Union in her locale.

Henry Havelock Ellis was an English physician, eugenicist, writer, progressive intellectual and social reformer who studied human sexuality. He co-wrote the first medical textbook in English on homosexuality in 1897, and also published works on a variety of sexual practices and inclinations, as well as on transgender psychology. He developed the notions of narcissism and autoeroticism, later adopted by psychoanalysis.