The Tionety uezd was a county (uezd) of the Tiflis Governorate of the Caucasus Viceroyalty of the Russian Empire, and then of Democratic Republic of Georgia, with its administrative centre in Tionety (present-day Tianeti). The area of the uezd roughly corresponded to the contemporary Mtskheta-Mtianeti region of Georgia.
Following the Russian Revolution, the Tionety uezd was incorporated into the short-lived Democratic Republic of Georgia.
The subcounties (uchastoks) of the Tionety uezd in 1913 were as follows:
According to the 1897 Russian Empire census, the Tionety uezd had a population of 34,153 on , including 16,431 men and 17,722 women. The majority of the population indicated Georgian to be their mother tongue, with a significant Chechen speaking minority.
According to the 1917 publication of Kavkazskiy kalendar, the Tionety uezd had a population of 49,350 on , including 24,402 men and 24,948 women, 48,666 of whom were the permanent population, and 684 were temporary residents: