Mikalai Dvornikau (Belarusian: Мікалай Мікалаевіч Дворнікаў, Mikalai Mikalaevich Dvornikau Russian: Николай Николаевич Дворников, Nikolai Nikolaevich Dvornikov) known under the pseudonyms Gerasim, Andrei, Anton, Stanislav Tomashevich, Robert and Petya (7 December 1907 – 16 February 1938) was a Soviet Belarusian political militant, a member of the Communist Party of Western Belarus and the Communist Youth League (Komsomol) of Western Belarus.

He was a participant of the Spanish Civil War, political instructor of the Jose Palafox battalion and commander of the Ukrainian interbrigade company Taras Shevchenko.

[1] Dvornikau became one of the organizers of the peasants' armed uprising on 3–4 August in Kobryń district, which was brutally suppressed, and ended with pacification actions and arrests.

He organized an assassination attempt on the Polish political intelligence agent Jan Strelchuk, who had been infiltrated into the communist underground and had revealed many CPWB members.

Under the pseudonym Staislav Tomashevich he served as a political instructor in the Jose Palafox Battalion, which was a part of the XIII Dombrowski International Brigade.