Arbuzynka Raion (Ukrainian: Арбузинський район) was a subdivision of Mykolaiv Oblast of Ukraine.

)[1] In the beginning of the 19th century, the current area of the district belonged to Yelisavetgradsky Uyezd of Kherson Governorate.

In 1816, the areas of Konstantinovskaya and Blagodatnovskaya Volosts were made military settlements.

In 1923, uyezds in Ukrainian Soviet Socialist Republic were abolished, and the governorates were divided into okruhas.

In 1930, okruhas were abolished, and in 1931, Arbuzynka Raion, with the administrative center in Harbuzynka, was established.