Vitebsk or Vitsyebsk is a city in northern Belarus. It serves as the administrative center of Vitebsk Region and Vitebsk District, though it is administratively separated from the district. As of 2025, it has 358,927 inhabitants, making it the country's fourth-largest city. It is served by Vitebsk Vostochny Airport and Vitebsk Air Base.

Vitebsk developed from a river harbor where the Vitba River [ru] (from which it derives its name) flows into the larger Western Dvina, which is spanned in the city by the Kirov Bridge. The name of the river is said to be derived from vit (lit. 'swamp' or 'wet place').

Archaeological research indicates that Baltic tribes had settlements at the mouth of Vitba. In the 9th century, Slavic settlements of the tribal union of the Krivichs replaced them. According to the Chronicle of Michael Brigandine (1760), Princess Olga of Kiev founded Vitebsk (also recorded as Dbesk, Vidbesk, Videbsk, Vitepesk, or Vicibesk) in 974. Other versions give 947 or 914. Academician Boris Rybakov and historian Leonid Alekseyev have come to the conclusion, based on the chronicles, that Princess Olga of Kiev could have established Vitebsk in 947. Leonid Alekseyev suggested that the chroniclers, when transferring the date from the account of the Byzantine era (since the creation of the world) to a new era, obtained the year 947, later mistakenly written in copying manuscripts as 974. It was an important place on the trade route from the Varangians to the Greeks. By the end of the 12th century, Vitebsk became a center of trade and commerce, and the center of an independent principality, following the Polotsk, and at times, the Smolensk and Kiev princes.

The official year of the founding of Vitebsk is 974, based on an anachronistic legend of founding by Olga of Kiev, but the first mention in historical records dates from 1021, when Yaroslav the Wise of Kiev gave it to Bryachislav Izyaslavich, Prince of Polotsk.

In the 12th and 13th centuries, Vitebsk functioned as the capital of the Principality of Vitebsk, an appanage principality which thrived at the crossroads of the river routes between the Baltic and Black seas. In 1320 the city was incorporated into the Grand Duchy of Lithuania as dowry of the Princess Maria, the first wife of Grand Duke of Lithuania Algirdas. By 1351 the city had erected a stone Upper and Lower Castle, the prince's palace. In 1410 Vitebsk participated in the Battle of Grunwald.

From 1503 it was the capital of the Vitebsk Voivodeship. In 1569 it became part of the Polish–Lithuanian Commonwealth. In 1597 Vitebsk was granted Magdeburg rights and a coat of arms by Sigismund III Vasa. However, the rights were taken away in 1623 after the citizens revolted against the imposed Union of Brest and killed Archbishop Josaphat Kuntsevych of Polotsk. In 1641 Władysław IV Vasa restored Magdeburg rights. The city was almost completely destroyed by the Russians in 1654, during the Russo-Polish War, and in 1708, during the Great Northern War. In the First Partition of Poland in 1772, the Russian Empire annexed Vitebsk.

The town once had three castles: the Upper Castle, which housed the voivode’s palace, the Lower Castle, and the Uzgorski Castle. The first two were destroyed by fire in 1614 but were later rebuilt; however, by the 19th century, none of the castles remained. In addition to raids, Vitebsk was frequently struck by fires—in the years 1335, 1614, 1629, 1680, 1698, 1707, 1733, 1752, 1757, and 1762.

Under the Russian Empire, the historic centre of Vitebsk was rebuilt in the Neoclassical style.