Sergei Sergeyevich Alexeyev (Russian: Серге́й Серге́евич Алексе́ев; 28 July 1924 – 12 May 2013) was a Soviet and Russian legal scholar and politician.

He was the first and only chairman of the Committee for Constitutional Supervision of the USSR from 1990 to 1991.

Later, he was one of the co-authors of the Constitution of Russia of 1993,[1] along with Anatoly Sobchak and Sergey Shakhray.

On 12 May 2013 Alexeyev died of a heart attack.

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