War and Peace (Russian: Война и мир, Война и миръ, Voiná i mir), also known as War and Peace, is a novel by the Russian writer Leo Tolstoy (1828–1910), who began writing during a time of convalescence after breaking his arm when he fell from a horse on a hunting party in 1864. It was first published as magazine fascicles (1865-1869). War and Peace is considered to be the author's masterpiece along with his later work, Anna Karenina (1873-1877).

It is considered one of Tolstoy's greatest literary achievements and remains an internationally acclaimed classic of world literature.