Sergei Dorensky (born 1931) is a Russian pianist.
He was trained under Grigory Ginsburg at the Moscow Conservatory. Dorensky was awarded a Gold Medal at the 5th World Festival of Youth and Students and the 1957 Rio de Janeiro Competition's 2nd Prize, which allowed him to perform through Western Europe and America.
That same year he was appointed a teacher at the Moscow Conservatory, where he held a professorship from 1978-1997. He was named a People's Artist of Russia in 1989, and was decorated the Order of Friendship eight years later. He is the Russian Fryderyk Chopin and Sergey Rachmaninov Societies' vice-president.