Belomorsky District (; ) is an administrative district (raion), one of the fifteen in the Republic of Karelia, Russia. It is located in the east of the republic. The area of the district is . Its administrative center is the town of Belomorsk. As of the 2010 Census, the total population of the district was 19,118, with the population of Belomorsk accounting for 58.7% of that number.
Within the framework of administrative divisions, Belomorsky District is one of the fifteen in the Republic of Karelia and has administrative jurisdiction over one town (Belomorsk) and fifty-six rural localities. As a municipal division, the district is incorporated as Belomorsky Municipal District. The town of Belomorsk and eleven rural localities are incorporated into an urban settlement, while the remaining forty-five rural localities are incorporated into three rural settlements within the municipal district. The town of Belomorsk serves as the administrative center of both the administrative and municipal district.