Mark Lvovich Slonim (Russian: Марк Льво́вич Сло́ним, also known as Marc Slonim and Marco Slonim; March 23, 1894 – 1976) was a Russian politician, literary critic, scholar and translator. He was a lifelong member of the Socialist Revolutionary Party, and, in 1917, served as its deputy for Bessarabia in the Russian Constituent Assembly. He joined the Samara Government during the early phases of the Civil War, opposing both the Bolsheviks and the conservative elements of the White movement. Assigned to his party's Foreign Delegation, Slonim lobbied unsuccessfully for the return of Bessarabia to Russia during the Paris Peace Conference. After a short stay in Tuscany, he settled in Czechoslovakia in 1922, an editor of Volya Rossii review.