Sergei Borisovich Prokhanov (Russian: ?????´? ????´????? ?????´???; born December 29, 1952, Moscow) is a Soviet and Russian theater and film actor, theater director, artistic director of Moscow's Luna Theater.
People's Artist of the Russian Federation (2005).
The most famous for him was the role Kesha Chetvergov in the Vladimir Grammatikov's comedy Mustached Nanny (1977).