Osłowo is a village in the administrative district of Gmina Mielnik, within Siemiatycze County, Podlaskie Voivodeship, in north-eastern Poland, close to the border with Belarus.
According to the 1921 census, the village was inhabited by 114 people, among whom 15 were Roman Catholic, 90 Orthodox, and 9 Mosaic. At the same time, 105 inhabitants declared Polish nationality, 9 Jewish. There were 20 residential buildings in the village.Skorowidz miejscowości Rzeczypospolitej Polskiej: opracowany na podstawie wyników pierwszego powszechnego spisu ludności z dn. 30 września 1921 r. i innych źródeł urzędowych., t. T. 5, województwo białostockie, 1924, s. 26.
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