Hans Jakob Christoffel von Grimmelshausen was a German author. He is best known for his 1669 picaresque novel Simplicius Simplicissimus and the accompanying Simplician Scriptures series.

Hargrave Jennings (1817–1890) was a British Freemason, Rosicrucian, author on occultism and esotericism, and amateur student of comparative religion.

Harl Vincent was the pen name of Harold Vincent Schoepflin, an American mechanical engineer and science fiction author. He was published regularly in science fiction pulp magazines.

Harlan Jay Ellison was an American writer, known for his prolific and influential work in New Wave speculative fiction and for his outspoken, combative personality. His published works include more than 1,700 short stories, novellas, screenplays, comic book scripts, teleplays, essays, and a wide range of criticism covering literature, film, television, and print media. Some of his best-known works include the 1967 Star Trek episode "The City on the Edge of Forever", considered by some to be the greatest episode of Star Trek ever(he subsequently wrote a book about the experience that includes his original screenplay), his A Boy and His Dog cycle, and his short stories "I Have No Mouth, and I Must Scream" and "'Repent, Harlequin!' Said the Ticktockman". He was also editor and anthologist for Dangerous Visions (1967) and Again, Dangerous Visions (1972). Ellison won numerous awards, including multiple Hugos, Nebulas, and Edgars.

Sir Harold Mario Mitchell Acton was a British writer, scholar, and aesthete who was a prominent member of the Bright Young Things. He wrote fiction, biography, history and autobiography. During his stay in China, he studied the Chinese language, traditional drama, and poetry, some of which he translated.

Harold Avery (1867–1943) was an English author of children's literature.

Edward Harold Begbie, also known as Harold Begbie, was an English journalist and the author of nearly 50 books and poems. Besides studies of the Christian religion, he wrote numerous other books, including political satire, comedy, fiction, science fiction, plays and poetry. He died in London on 8 October 1929.

Harold Bell Wright was a best-selling American writer of fiction, essays, and nonfiction. Although mostly forgotten or ignored after the middle of the 20th century, he had a very successful career; he is said to have been the first American writer to sell a million copies of a novel and the first to make $1 million from writing fiction. Between 1902 and 1942 Wright wrote 19 books, several stage plays, and many magazine articles. More than 15 movies were made or claimed to be made from Wright's stories, including Gary Cooper's first major movie, The Winning of Barbara Worth (1926) and the John Wayne film The Shepherd of the Hills (1941).

Harold Brighouse was an English playwright and author whose best known play is Hobson's Choice. He was a prominent member, together with Allan Monkhouse and Stanley Houghton, of a group known as the Manchester School of dramatists.

Harold Edward Palmer, usually just Harold E. Palmer, was an English linguist, phonetician and pioneer in the field of teaching English as a second language. Especially he dedicated himself to Oral Method. He stayed in Japan for 14 years and reformed its English education. He contributed to the development of the applied linguistics of the 20th century.