Jacques d'Adelswärd-Fersen, French author and poet (d. 1923)
Baron Jacques d'Adelswärd-Fersen (20 February 1880 – 5 November 1923) was a French novelist and poet. His life forms the basis of a fictionalised 1959 novel by Roger Peyrefitte entitled The Exile of Capri (L'exilé de Capri).

In 1903, a scandal involving school pupils made d'Adelswärd persona non grata in the salons of Paris and dashed his marriage plans. For much of the rest of his life, he took up residence on Capri in self-imposed exile with his long-time lover, Nino Cesarini. He became a "character" on the island in the inter-war years, featuring in novels by Compton MacKenzie and others. His house, Villa Lysis, remains one of Capri's tourist attractions.