Nikolai Nikolayevich Sidelnikov (Russian: Никола́й Никола́евич Сиде́льников, June 5, 1930, Tver – 1992) was a Russian Soviet composer.
Sidelnikov studied with E. O. Messner and Yuri Shaporin at the Moscow Conservatory. He taught at the Moscow Conservatory where he was a professor from 1981. Among his pupils were Vyacheslav Artemov, Eduard Artemyev, Dmitri Smirnov, Vladimir Tarnopolsky, Vladimir Martynov, Anton Rovner, Sergey Pavlenko, Ivan Glebovich Sokolov and Vladimir Bitkin.
His works include operas:
- Alen'kiy Tsvetochek (The Scarlet Flower, after S. Aksakov, 1974)
- Chertogon (opera dilogy after Nikolai Leskov: Zagul, Pokhmelye, 1978–1981)
- Beg (The Run after Mikhail Bulgakov, 1987)
- Stepan Razin
and also: 6 symphonies, an oratorio, cantatas, choral, chamber and vocal music.
- Russkie skazki (Русские сказки — The Russian Fairy Tales, 1968) - a concert for 12 players is one of his most notable compositions.