Robert Lynn Asprin (June 28, 1946 May 22, 2008) was an American Science Fiction and fantasy author and active fan, best known for his humorous MythAdventures and Phule’s Company series.

Esther Rochon (née Blackburn) (born 27 June 1948) is a Canadian Science Fiction writer.

James Patrick Hogan (27 June 1941 12 July 2010) was a British Science Fiction author.

Colin Henry Wilson (born 26 June 1931) is a prolific English writer who first came to prominence as a philosopher and novelist. Wilson has since written widely on true crime, mysticism and other topics. He prefers calling his philosophy new existentialism or phenomenological existentialism.

Charles Sheffield (June 25, 1935 November 2, 2002), was an English-born mathematician, physicist and Science Fiction author. He was also a President of the Science Fiction and Fantasy Writers of America and of the American Astronautical Society.

Eric Arthur Blair (25 June 1903 21 January 1950), better known by his pen name George Orwell, was an English novelist and journalist. His work is marked by keen intelligence and wit, a profound awareness of social injustice, an intense opposition to totalitarianism, a passion for clarity in language and a belief in democratic socialism.

Sir Fred Hoyle FRS (24 June 1915 20 August 2001) was an English astronomer and mathematician noted primarily for his contribution to the theory of stellar nucleosynthesis and his often controversial stance on other cosmological and scientific matters – in particular his rejection of the “Big Bang” theory, a term originally coined by him out of ridicule for the main rival of his own theory. In addition to his work as an astronomer, Hoyle was a writer of Science Fiction, including a number of books co-written with his son Geoffrey Hoyle. Hoyle spent most of his working life at the Institute of Astronomy at Cambridge and served as its director for a number of years. He died in Bournemouth, England, after a series of strokes.

Francis Leslie Ashton (24 June 1904 July 1994) was a British writer known for his first novel Breaking of the Seals in 1946 and a kind of sequel Alas, That Great City from 1948. The two novels concern disasters involving objects orbiting the Earth in prehistoric times. In 1952 he co-wrote Wrong Side of the Moon, which concerns space travel.

Michael Shaara (June 23, 1928 – May 5, 1988) was an American writer of Science Fiction, sports fiction, and historical fiction. He was born to Italian immigrant parents (the family name was originally spelled Sciarra, which in Italian is pronounced the same way) in Jersey City, New Jersey, graduated from Rutgers University in 1951, and served as a sergeant in the 82nd Airborne division prior to the Korean War.

Eileen Gunn (b. June 23, 1945, Dorchester, Massachusetts) is a Science Fiction author and editor based in Seattle, Washington, who began publishing in 1978.