Nadezhda Konstantinovna "Nadya" Krupskaya (Russian: Наде́жда Константи́новна Кру́пская, scientific transliteration Nadežda Konstantinovna Krupskaja) was a Russian Bolshevik revolutionary. She was the daughter of a military officer. She married the Russian revolutionary leader Vladimir Lenin in 1898.
She was a functionary of the bolshevik faction of the Russian Social Democratic Labour Party from 1903. After the October Revolution, she was appointed deputy to Anatoliy Lunacharskiy, the People's Commissar for Education, where she took charge of Vneshkol'nyi Otdel the Adult Education Division. She was also fundamental in the development of Soviet librarianship. Her relationship with Lenin was more professional than marital, but she remained loyal, never once considering divorce.