Roskilde is a city 30 km (19 mi) west of Copenhagen on the Danish island of Zealand. With a population of 52,580, the city is a business and educational centre for the region and the 10th largest city in Denmark. It is governed by the administrative council of Roskilde Municipality.

Zealand at 7,031 km2 is the largest and most populous island in Denmark proper. Zealand had a population of 2,319,705 on 1 January 2020, comprising 40% of the country's population.