Gabriele Pasquale Giuseppe Rossetti was an Italian nobleman, poet, constitutionalist, scholar, and founder of the secret society Carbonari.

Gaillard T. Hunt was an American writer and civil servant.

Gaius Glenn Atkins was a Congregational minister, author, and a professor of homiletics at Auburn Theological Seminary in New York City.

Aelius Galenus or Claudius Galenus, often Anglicized as Galen or Galen of Pergamon, was a Roman Greek physician, surgeon and philosopher. Considered to be one of the most accomplished of all medical researchers of antiquity, Galen influenced the development of various scientific disciplines, including anatomy, physiology, pathology, pharmacology, and neurology, as well as philosophy and logic.

Galileo di Vincenzo Bonaiuti de' Galilei was an Italian astronomer, physicist and engineer, sometimes described as a polymath. Commonly referred to as Galileo, his name is pronounced. He was born in the city of Pisa, then part of the Duchy of Florence. Galileo has been called the father of observational astronomy, modern-era classical physics, the scientific method, and modern science.

Garcilaso de la Vega, KOS was a Spanish soldier and poet. Although not the first or the only one to do so, he was the most influential poet to introduce Italian Renaissance verse forms, poetic techniques, and themes to Spain. He was well known in poetic circles during his lifetime, and his poetry has continued to be popular without interruption until the present. His poetry was published posthumously by Juan Boscán in 1543, and it has been the subject of several annotated editions, the first and most famous of which appeared in 1574.

Gaston Louis Alfred Leroux was a French journalist and author of detective fiction.

Gaston Tissandier was a French chemist, meteorologist, aviator, and editor. He escaped besieged Paris by balloon in September 1870. He founded and edited the scientific magazine La Nature and wrote several books.

Gene Stratton-Porter, born Geneva Grace Stratton, was an American writer, nature photographer, and naturalist from Wabash County, Indiana. In 1917 Stratton-Porter urged legislative support for the conservation of Limberlost Swamp and other wetlands in Indiana. She was also a silent film-era producer who founded her own production company, Gene Stratton Porter Productions, in 1924.

Geoffrey Chaucer was an English poet, author, and civil servant best known for The Canterbury Tales. He has been called the "father of English literature", or, alternatively, the "father of English poetry". He was the first writer to be buried in what has since come to be called Poets' Corner, in Westminster Abbey. Chaucer also gained fame as a philosopher and astronomer, composing the scientific A Treatise on the Astrolabe for his 10-year-old son Lewis. He maintained a career in the civil service as a bureaucrat, courtier, diplomat, and member of parliament.