Gilbert Harman was an American philosopher, who taught at Princeton University from 1963 until his retirement in 2017. He has published widely in philosophy of language, cognitive science, philosophy of mind, ethics, moral psychology, epistemology, statistical learning theory, and metaphysics. He and George Miller co-directed the Princeton University Cognitive Science Laboratory. Harman has taught or co-taught courses in Electrical Engineering, Computer Science, Psychology, Philosophy, and Linguistics.

Gilbert Arthur Highet was a Scottish American classicist, academic writer, intellectual critic, and literary historian.

Gilbert Hottois was a Belgian professor of philosophy at the Université Libre de Bruxelles who specialised in Bioethics.

Gilbert James French (1804–1866), was a textile manufacturer and the biographer of Samuel Crompton.

Gilbert Lascault was a French novelist, essayist, and art critic.

Gilbert Morris was a Christy Award-winning Christian author. He is also sometimes cited as Gilbert L. Morris or Gilbert Leslie Morris.

George Gilbert Aimé Murray was an Australian-born British classical scholar and public intellectual, with connections in many spheres. He was an outstanding scholar of the language and culture of Ancient Greece, perhaps the leading authority in the first half of the twentieth century. He is the basis for the character of Adolphus Cusins in his friend George Bernard Shaw's play Major Barbara, and also appears as the chorus figure in Tony Harrison's play Fram.

Gilbert Norwood was a British classical philologist and essayist.

William George "Gilbert" Patten was a writer of dime novels and is best known as author of the Frank Merriwell stories, with the pen name Burt L. Standish.

Gilbert Phelps was a British educationist and author, best known for nine distinguished novels that he wrote between 1953 and 1975 and for his literary criticism which embraces several foreign literatures, chiefly Russian and African.