| Troki uezd | |
| Native Name: | Трокскій уѣздъ |
| Native Name Lang: | ru |
| Settlement Type: | Uezd |
| Mapsize: | 225px |
| Subdivision Type: | Country |
| Subdivision Name: | Russian Empire |
| Subdivision Type1: | Krai |
| Subdivision Name1: | Northwestern |
| Subdivision Type2: | Governorate |
| Subdivision Name2: | Vilna |
| Established Title: | Established |
| Established Date: | 1795 |
| Extinct Title: | Abolished |
| Extinct Date: | 1920 |
| Seat Type: | Capital |
| Seat: | Troki |
| Area Total Km2: | 5151 |
| Population As Of: | 1897 |
| Population Total: | 203,401 |
| Population Density Km2: | auto |
| Population Urban: | 1.59% |
| Population Rural: | 98.41% |
| Total Type: | Total |
The Troki uezd was a county (uezd) of the Vilna Governorate of the Russian Empire. The uezd was bordered by the Mariampol, Kalvariya, and the Seyny uezds of the Suwałki Governorate to the west, the Lida uezd to the south, the Vilna uezd to the east, and the Kovno uezd of the Kovno Governorate to the north. The administrative centre of the county was the city of Troki (present-day Trakai). The area included most of the modern Trakai, Elektrėnai districts of Vilnius County, and Varėna, Šalčininkai districts of Alytus County, as well as part of Kaišiadorys, Alytus, and Prienai districts.
At the time of the Russian Empire Census of 1897, Troksky Uyezd had a population of 203,401. Of these, 58.1% spoke Lithuanian, 15.7% Belarusian, 11.3% Polish, 9.5% Yiddish, 4.6% Russian, 0.4% Tatar, 0.2% German and 0.1% Ukrainian as their native language.[1]