Sidelnikov (masculine, Russian: Сидельников) or Sidelnikova (feminine, Russian: Сидельникова), also Romanized as Sydelnykov, is a Russian surname. Notable people with the surname include:
Aleksei Sidelnikov (born 1988), Russian footballer
Alexander Sidelnikov (1950–2003), Russian Soviet ice hockey player
Andrei Gennadyevich Sidelnikov (born 1980), Russian-born Kazakh footballer
Andriy Sydelnykov (born 1967), Ukrainian Soviet footballer
Anton Sidelnikov (born 1981), Russian footballer
Kirill Sidelnikov (born 1988), Russian mixed martial artist
Nikolai Sidelnikov (1930–1992), Russian Soviet composer
Viktor Sidelnikov (born 1963), Belarusian Soviet volleyball player
