Harold Pinter was a British playwright, screenwriter, director and actor. A Nobel Prize winner, Pinter was one of the most influential modern British dramatists with a writing career that spanned more than 50 years. His best-known plays include The Birthday Party (1957), The Homecoming (1964) and Betrayal (1978), each of which he adapted for the screen. His screenplay adaptations of others' works include The Servant (1963), The Go-Between (1971), The French Lieutenant's Woman (1981), The Trial (1993) and Sleuth (2007). He also directed or acted in radio, stage, television and film productions of his own and others' works.

Harold R. Jacobs, who authored three mathematics books, both taught the subject and taught those who teach it. Since retiring he has continued writing articles, and as of 2012 had lectured "at more than 200" math conferences.

Harold Robbins was an American author of popular novels. One of the best-selling writers of all time, he wrote over 25 best-sellers, selling over 750 million copies in 32 languages.

Harold Rosenberg was an American writer, educator, philosopher and art critic. He coined the term Action Painting in 1952 for what was later to be known as abstract expressionism. Rosenberg is best known for his art criticism. From 1962 until his death, he was the art critic of The New Yorker.

Harold Morrow Sherman (1898–1987) was an American writer, lecturer and psychical researcher.

Harold Dunham Speakman was an early twentieth-century American author and artist, best known for the travel narratives Here’s Ireland (1925) and Mostly Mississippi (1927).

Harold Van Buren Voorhis was a chemist, noted Masonic author, and executive at Macoy Publishers and Masonic Supply Company.

Haroldo Conti was an Argentine writer, screenwriter, teacher and Latin professor. On May 5, 1976 he disappeared during the Proceso de Reorganización Nacional military dictatorship; on this day the "Día del Escritor Bonaerense" is held to commemorate this date of his kidnap.

Haroldo Eurico Browne de Campos was a Brazilian poet, critic, professor and translator. He is widely regarded as one of the most important figures in Brazilian literature since 1950.

Haroon Yousofi is an Afghan journalist, poet and satirist living in London.