Hamilton was born in Norwood. He took his mother's maiden name when he began to write. Hamilton was married twice: First to Beryl Faber, née Beryl Crossley Smith, the sister of C. Aubrey Smith, who died in 1912, and then to Julia Bolton, the former wife of playwright Guy Bolton. He was the brother of writers A. Hamilton Gibbs and Sir Philip Gibbs.
His London musicals include The Catch of the Season (1904), The Belle of Mayfair (1906), The Beauty of Bath (1906). He then wrote a number of Broadway shows, and many screenplays. He died, aged 72, in Guildford, England.
Hamilton wrote dozens of novels, averaging a novel per year most of his adult life. His novels include:
- Plain brown (1909)
- A plea for the younger generation (1913)
- The door that has no key (1913)
- The Miracle of Love (1914)
- The Sins of the Children (1916)
- Two kings and other romances (1917)
- Who cares? a story of adolescence (1919) ISBN 978-1-4069-2525-8
- The Rustle of Silk (1922)
- His Majesty, the King: A Romantic Love Chase of the Seventeenth Century (1926) ISBN 978-0-548-02418-8
- Twentieth Century Authors: A Biographical Dictionary of Modern Literature, edited by Stanley J. Kunitz and Howard Haycraft, New York, The H. W. Wilson Company, 1942.
- Works by Cosmo Hamilton at Project Gutenberg
- Site includes list of Hamilton's novels
- Who Cares? a story of adolescence by Cosmo Hamilton at Project Gutenberg
- Cosmo Hamilton at the Internet Movie Database
- Broadway credits
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