Yevgeni Alekseyevich Preobrazhensky (Russian: ????´??? ??????´???? ?????????´?????, IPA: [j?v'g?en??j ?l??'ks?ej?v??t?? pr???br?'??nsk??j]; 1886–1937) was a Russian revolutionary and economist.
A member of the governing Central Committee of the Bolshevik faction and its successor, the All-Union Communist Party, Preobrazhensky is remembered as a leading voice for the rapid industrialisation of peasant Russia through a concentration on state-owned heavy industry.
Closely associated with Leon Trotsky and the Left Opposition movement of the 1920s, Preobrazhensky fell afoul of the secret police during the decade of the 1930s, suffering expulsion from the Communist Party and internal exile in 1933 and a new arrest ending in execution in 1937 during the Great Purge.