Domanivka Raion (Ukrainian: Доманівський район) was a subdivision of Mykolaiv Oblast of Ukraine. Its administrative center was the urban-type settlement of Domanivka. 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 Domanivka Raion was merged into Voznesensk Raion. The last estimate of the raion population was 24,447 (2020 est.)