Sayda-Guba (Russian: Сайда-Губа; English: Sayda Bay) is a rural locality (an inhabited locality) within the administrative jurisdiction of the closed administrative-territorial formation of Alexandrovsk in Murmansk Oblast, Russia,[1] located beyond the Arctic Circle at a height of 10 meters (33 ft) above sea level.

[2] The colony of Sayda-Guba was one of the twenty-one included into Alexandrovskaya Volost of Alexandrovsky Uyezd of Arkhangelsk Governorate upon its establishment on July 1, 1920.

[7] On February 26, 1935, the Presidium of the Leningrad Oblast Executive Committee worked out the details of the new district scheme and issued a resolution, which, among other things, ordered the administrative center of Polyarny District to be moved from Polyarnoye to Sayda-Guba.

[7] Due to military construction in Polyarnoye, the administrative center was instead moved to Murmansk in the beginning of 1935.

[7] Sayda-Guba now serves as the storage location for reactor compartments from decommissioned Russian nuclear submarines.