Sergey Leonidovich Katanandov (Russian: Сергей Леонидович Катанандов; 21 April 1955) is a Russian politician who served as the leader of the Republic of Karelia, an autonomous entity of Russia, in 1998–2010, first as Prime Minister, then as Head of the Republic.

Educated in civil engineering and law, Katanandov served as Mayor of Petrozavodsk from 1990 to 1998, and became Chairman of the Government of Karelia in 1998.

Katanandov was born to Karelian parents in Petrozavodsk on April 21, 1955.

He graduated from the Faculty of industrial and civil construction of Petrozavodsk State University in 1977.

Eventually he ended up becoming a popular politician in Russia.