Riddarholmen (Swedish: [ˈrɪ̂dːarˌhɔlːmɛn], "The Knights' Islet") 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.
The western end of the island gives a magnificent panoramic and photogenic view of the bay Riddarfjärden, often used by TV journalists with Stockholm City Hall in the background. A statue of Birger Jarl, traditionally considered the founder of Stockholm, stands on a pillar in front of the Bonde Palace, north of Riddarholm Church.
Other notable buildings include the Old Parliament Building in the south-eastern corner, the Old National Archive on the eastern shore, and the Norstedt Building, the old printing house of the publisher Norstedts, the tower roof of which is a well-known silhouette on the city's skyline.