Nikolai Grigoryevich Grinko or Mykola Hryhorovych Hrynko (Ukrainian: Микола Григорович Гринько; Russian: Николай Григорьевич Гринько) was a Soviet and Ukrainian actor.

His film debut was in the role of a rebel in the film "Taras Shevchenko" by Igor Savchenko. He is best known for his roles in the films of Andrei Tarkovsky, including: Ivan's Childhood, Andrei Rubliov, Solaris, Mirror, and Stalker, as well as Sergei Parajanov's "Shadows of Forgotten Ancestors".