Sventsyany uezd

The Sventsyany uezd, known until 1842 as the Zavileisky uezd, was a county (uezd) of the Vilna Governorate of the Russian Empire.

The uezd was bordered by the Vilna uezd to the west, the Oshmyany uezd to the south, the Vileyka uezd to the east, the Disna uezd to the northeast, and the Novoaleksandrovsk uezd of the Kovno Governorate to the north. The administrative centre was located in Sventsyany (modern-day Švenčionys). The Sventsyany uezd included the most part of Švenčionys District and Pastavy District of Belarus.

Demographics
At the time of the Russian Empire Census of 1897, Sventsyansky Uyezd had a population of 172,231. Of these, 47.5% spoke Belarusian, 33.8% Lithuanian, 7.1% Yiddish, 6.0% Polish, 5.4% Russian and 0.1% German as their native language.