Natalia Ivanovna Sedova (Russian: Ната́лья Ива́новна Седо́ва, IPA: [nɐˈtalʲjə ɪˈvanəvnə sʲɪˈdovə]; 5 April 1882 – 23 January 1962) was a Russian revolutionary and author known as the second wife of Leon Trotsky. She wrote on cultural matters pertaining to Marxism.