Toruń [ˈtɔruɲ] ( listen) (German: Thorn ( listen), Kashubian: Torń, Latin: Thorunium, see also: other names) is an ancient city in northern Poland, on the Vistula River. Its population is 205,934 as of June 2009. Toruń is one of the oldest cities in Poland. The medieval old town of Toruń is the birthplace of the astronomer Nicolaus Copernicus.

In 1997 the medieval part of the city was designated a UNESCO World Heritage Site. In 2007 the Old Town in Toruń was added to the list of Seven Wonders of Poland. National Geographic Polska rated the old town market and the Gothic town hall as one of the "30 Most Beautiful Places in the World." In 2010 Forbes magazine ranked Toruń as number one of the "Polish Cities Attractive for Business".^{[citation needed]} In 2009 it was listed as one of the "Best Cities to Live in Poland", in a ranking published by Przekrój.^{[citation needed]}

Previously it was the capital of the Toruń Voivodeship (1975–98) and the Pomeranian Voivodeship (1921–45). Since 1999, Toruń has been a seat of the self-government of the Kujawy-Pomerania Province and, as such, is one of its two capitals (together with Bydgoszcz). The cities and neighboring counties form the Bydgoszcz-Toruń bi-polar metropolitan area. In September 2004, Bydgoszcz Medical School joined Toruń's Nicolaus Copernicus University as its Collegium Medicum.