Ivan Tolstoy may refer to: Ivan Andreyevich Tolstoy (1644–1713), Russian officer in the army of Tsar Peter I Ivan Ivanovich Tolstoy (1858–1916), Imperial Russian politician Ivan Matveyevich Tolstoy (1806–1867), Russian nobleman, diplomat, senator, grand master of court ceremonies, and minister of postal service Ivan Tolstoy (scientist) (1923–2023), American geophysicist and popular science writer