Riddarholmen is a small islet in central Stockholm, Sweden. The island forms part of Gamla Stan, the old town, and houses a number of private palaces dating back to the 17th century. The main landmark is the church Riddarholmskyrkan, used as Sweden's royal burial church from the 17th century to 1950, and where a number of earlier Swedish monarchs also lie buried.

Gamla stan, until 1980 officially Staden mellan broarna, is the old town of Stockholm, Sweden. Gamla stan consists primarily of the island Stadsholmen. Officially, but not colloquially, Gamla stan includes the surrounding islets Riddarholmen, Helgeandsholmen and Strömsborg. It has a population of approximately 3,000.