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Paul Spaak (5 July 1871–8 May 1936) was a Belgian lawyer and playwright.
Born in Ixelles, Spaak graduated in law at the Université Libre de Bruxelles in 1894. On 22 July 1894, he married Marie Janson, daughter of Paul Janson. The couple had four children, of whom Paul-Henri Spaak, later Belgian Prime Minister like his uncle Paul-Emile Janson, was the most famous. Paul Spaak was a member of Royal Academy of Belgium from 19 August 1920 until 8 May 1936.