Komitat Neutra
Osuský was born in March 1889 in Brezová pod Bradlom, in the Nyitra County of the Kingdom of Hungary (present-day Slovakia). In 1902 he began his studies at the Lutheran Lyceum in present-day Bratislava. However, in 1905 he was expelled from school because of his Slovak patriotic feelings and banned from all schools in the territory of the Dual Monarchy Austria-Hungary on a direct order of count Apponyi, Minister of Religion and Education of Hungary. Count Apponyi asked Osuský if he was going to be a "good Hungarian"; Osuský's silence on the question was taken by Apponyi as an offence. Osuský recalls the incident in his biography: