Sergei Nikitich Kovalev (Russian: Серге́й Ники́тич Ковалёв; 15 August 1919, Petrograd – 24 February 2011, Saint Petersburg) was a Russian engineer and architect who designed nuclear submarines for the Soviet Navy while leading the Rubin Design Bureau.

The only nuclear submarine designed by Rubin during the Cold War for which Kovalyov wasn't the chief designer was Project 685 Plavnik (NATO Mike class), the bureau's only SSN.

[1] Kovalev remained semi-active in naval engineering throughout his life, designing ice-resistant platforms for hydrocarbon exploration on the Arctic shelf in later years.

An accomplished painter in his retirement, he was made an honorary member of the Saint Petersburg Union of Artists.

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