Roskilde is a Danish town on East Zealand next to the southeastern part of Roskilde Fjord. It is one of the country's oldest cities and is the capital of Roskilde Municipality between Copenhagen, Ringsted, Holbæk and Denmark's 10th largest city with 51,262 inhabitants (2020). The city belongs to Region Zealand.

The town is located at the end of Roskilde Fjord in a hilly terrain, so the Cathedral can be seen from large parts of Northeast Zealand. The city was a large and important city already from the Middle Ages, as it had a cathedral and several monasteries were established. The bishop of Roskilde was one of the most powerful people in the country, and changing kings also prioritized the city. After the Reformation, the city's importance diminished, and the black death and large city fires further did their part to reduce the population up through the Renaissance and during the autocracy, where Copenhagen and the Øresund region grew strongly. During industrialization, the population grew steadily, as it did in most of the country.

With its infrastructure, the city is a regional hub and has been at least since the 18th century with the construction of Roskildevej 1770-76, the inauguration of Vestbanen in 1847, as the country's first railway, and most recently the construction of Holbækmotorvejen in the 1960s and Roskilde Airport. in the 1970s. In terms of trade, the city is also an important center with a large catchment area, where RO's Torv and the pedestrian streets in the center of the city attract people. Roskilde is a large educational city with i.a. vocational college, technical school, several high schools and Roskilde University.

The annual Roskilde Festival is visited by over 100,000 people from all over the world, and Roskilde is during this period the country's fourth largest city. Roskilde Cathedral is on UNESCO's World Heritage List, and the well-preserved Viking ships, called the Skuldelev ships, which are exhibited at the Viking Ship Museum, also attract many tourists. In addition, there are i.a. The Museum of Contemporary Art, Roskilde Museum and Museum Ragnarock.