Grodno, or Hrodna, is a city in western Belarus. It is one of the oldest cities in Belarus. The city is located on the Neman River, 300 kilometres (190 mi) from Minsk, about 15 kilometres (9.3 mi) from the border with Poland, and 30 kilometres (19 mi) from the border with Lithuania. Grodno serves as the administrative center of Grodno Region and Grodno District, though it is administratively separated from the district. As of 2025,^[update] the city has a population of 363,718.

The modern city of Grodno, founded in 1127, originated as a small fortress and trading outpost, on the extreme northern end of the deeply penetrated Slavic peninsula into the lands of the Baltic tribal union of the Yotvingians. It was also a home to the Dregoviches Slavic tribe. It was a significant city in Black Ruthenia and later part of the Grand Duchy of Lithuania, which joined the Polish-Lithuanian Union in 1385. Grodno faced numerous invasions, most notably by the Teutonic Knights. The city was an important trade, commerce, and cultural center in the Polish-Lithuanian Commonwealth, and one of its royal residences. The Kings of Poland and Grand Dukes of Lithuania allowed the creation of a Jewish commune in 1389, and the city received its charter in 1441. Grodno was the site of two battles during the Great Northern War.

Grodno has a rich history with various rulers and influences. In 1793, Grodno became the capital of the Grodno Voivodeship, but was annexed by Russia in 1795 after Third Partition of Poland. The city had a significant Jewish population before the Holocaust. After World War I, it was briefly part of the Belarusian People's Republic and the Republic of Lithuania before being taken over by Poland. During World War II, it was occupied by the Soviet Union and later by Nazi Germany. Since 1945, Grodno has been part of Belarus. Today, it has a diverse population, including Belarusians, Poles, and a small Jewish community. The city is known for its historical architecture, including the Old Grodno Castle, and is a center for Roman Catholicism and Polish culture in Belarus.

In Belarusian Classical Orthography (Taraškievica), the city is named as Горадня (Horadnia). In Latin, it was known as Grodna (-ae), in Polish as Grodno, in Lithuanian as Gardinas, in Latvian as Grodņa, in German as Garten, and in Yiddish as גראָדנע (Grodne).

Before arrival of the East Slavs to the Grodno Region in the 10th–11th centuries, the area was inhabited by Baltic tribe Yotvingians, who were heavily Lithuanized in the 5th-7th centuries already and especially during the formation of the State of Lithuania in the 13th century, and subsequently for a long time Grodno and its area was a part of the Ethnographic Lithuania (e.g. even in the 19th century the Lithuanian-inhabited areas were still nearby the present-day suburbs of Grodno city). The modern city of Grodno originated as a small fortress and a fortified trading outpost maintained by the Rurikid princes on the border with the lands of the Baltic tribal union of the Yotvingians. The first reference to Grodno dates to 1005.

The official foundation year is 1128. In this year Grodno was mentioned in the Kievan Chronicle as Goroden, and located at a crossing of numerous trading routes.^{[citation needed]} The same chronicle also reports in the year 1183: 'That same year all of Goroden burned, including all the stone churches, from a flash of lightning and a clap of thunder in a thunderstorm.'

Grodno became part of the Grand Duchy of Lithuania in the 13th century, and the local stronghold was rebuilt by Lithuanians. Prince Daniel of Galicia briefly captured the city in 1253 and once again attacked it in 1259. In 1276, Duke Traidenis gave shelter in Grodno to Yotvingians fleeing the Teutonic Knights' massacre. The city was unsuccessfully attacked by the Rus' princes and Tatars in 1277, then repeatedly attacked, with varying success, by the Teutonic Knights in 1283, 1296, 1306, 1311, 1312, 1328, 1361, 1363, 1373, 1375, 1377. In 1358 a convention took place in Grodno on border disputes between Lithuania and the Polish Duchy of Masovia.

Since 1385 Grodno formed part of the Polish–Lithuanian union. The famous Lithuanian Grand Duke Vytautas was the prince of Grodno from 1376 to 1392, and he stayed there during his preparations for the Battle of Grunwald (1410). During the Lithuanian Civil War of 1389–1392, the city was captured by Władysław II Jagiełło in 1390, and then by Vytautas in 1391, with Vytautas-allied Konrad von Wallenrode committing a massacre of 15 Polish prisoners-of-war. After the Ostrów Agreement of 1392, Vytautas expelled the Teutonic Knights, who in revenge captured the city, burned the castle and took 3,000 prisoners. The city was attacked one more time by the Teutonic Knights in 1402. Since 1413, Grodno had been the administrative center of a powiat in Trakai Voivodeship. Polish King Władysław II Jagiełło often stopped in Grodno, including in 1414, 1416, 1418 and 1425. In 1425, Polish-Teutonic talks concerning the borders took place there.