Berezanka Raion was a subdivision of Mykolaiv OblastUkraine. Its administrative center was the urban-type settlement of Berezanka. The raion was abolished on 18 July 2020 as part of the administrative reform of Ukraine, which reduced the number of raions of Mykolaiv Oblast to four. The area of Berezanka Raion was merged into Mykolaiv Raion. The last estimate of the raion population was 22,422

Mykolaiv Oblast, also referred to as Mykolaivshchyna, is an oblast (province) of Ukraine. The administrative center of the oblast is the city of Mykolaiv. At the most recent estimate, the population of the oblast stood at 1,091,821.