Rosario is the largest city in the central Argentina province of Santa Fe. The city is located 300 km (186 mi) northwest of Buenos Aires, on the west bank of the Paraná River. Rosario is the third-most populous city in the country. With a growing and important metropolitan area, Greater Rosario has an estimated population of 1,750,000 as of 2020.

Even though the city did not have a clear foundation date or any official acknowledgement thereof, most commentators state that Rosario was founded on 7 October 1793 with a local population of 457 inhabitants. Nonetheless, the town was officially declared a city on 3 August 1852, at the time it was known as Pago de los Arroyos, that is, "land of the streams", a reference to the several small rivers that traverse the southern region of Santa Fe.

Rosario is the centre of a metropolitan region whose economy is based on services and industry, generating the second-largest urban gross regional product of Argentina, after Greater Buenos Aires. The principal manufacturing sector is the agro industry. Other important sectors include the petrochemical sector.

Notable people from Rosario include the revolutionary Che Guevara, soccer player Lionel Messi and others.

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