Racibórz ra'ćibusz (Ratibor, Ratiboř, Racibōrz) is a city in Silesian Voivodeship in southern Poland. It is the administrative seat of Racibórz County.
With Opole, Racibórz is one of the historic capitals of Upper Silesia, being the residence of the Dukes of Racibórz from 1172 to 1521.
The city is situated in the southwest of the voivodeship on the upper Oder river, near the border with the Polish Opole Voivodeship and the Czech Republic. The Racibórz Basin (Kotlina Raciborska) forms the southeastern extension of the Silesian Lowlands, surrounded by the Opawskie Mountains in the west (part of the Eastern Sudetes), the Silesian Upland in the north, and the Moravian Gate in the south. The town centre is located about southwest of Katowice and about southeast of the regional capital Wrocław.
As of 2019, the city has a population of approximately 55,000 inhabitants. From 1975 to 1998, it belonged to Katowice Voivodeship.
Until the end of the 5th century AD, the lands of the later Racibórz settlement were inhabited by East Germanic Silinger tribes. The town is one of the oldest in Upper Silesia, the site of a hill fort where the old trade route from the Moravian Gate down to Kraków crossed the Oder river. There is a possibility that Racibórz was mentioned in a work of the "Bavarian Geographer" in 845 (this document mentions five strongholds of the Slavic Golensizi (Golenshitse, Holasici in Czech), a proto-Polish tribe, probably Racibórz was one of them). The name Racibórz is of Slavic origin and probably is derived from the name of one Duke Racibor, the city's founder.
However, the first confirmed mention of Racibórz was made in 1108 in the Gesta principum Polonorum chronicle by the Benedictine monk Gallus Anonymus, at a time when the Polish duke Bolesław III Wrymouth had to ward off the attacks by the forces of Duke Svatopluk of Bohemia invading from the Moravian lands in the south. The Polish rule over the Racibórz area was confirmed in 1137, it was incorporated into the Duchy of Silesia according to the Testament of Bolesław III in the following year.