| Sergei Alexeyev | |
| Native Name Lang: | ru |
| Birth Date: | 28 July 1924 |
| Birth Place: | Oryol, Russian SFSR, USSR |
| Death Place: | Saint Petersburg, Russia |
| Citizenship: | Soviet Union → Russia |
| Nationality: | Russian |
| Field: | Legal theory |
| Workplaces: | |
| Alma Mater: | Ural State Law University |
| Prizes: | Order "For Merit to the Fatherland" (3rd class), Order of Friendship of Peoples, Order of the Patriotic War (2nd class), Order of the Badge of Honour, USSR State Prize, Demidov Prize |
| Spouse: | Zoya Alexeyeva |
Sergei Sergeyevich Alexeyev (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.