Royal National City Park, National city park in Stockholm, Sweden.

The Royal National City Park stretches across Stockholm, Solna and Lidingö, covering 27 km² of old royal parkland. It takes in Djurgården, Hagaparken, Ulriksdal, Brunnsviken and the Fjäderholmarna islands, with oak woods, water and a paved path along the bank where a dark wooden bench faces the water. Djurgården holds northern Europe's largest stand of broad oaks, among them Prins Eugens ek.

The park was created by a unanimous parliamentary decision on 7 December 1994, after three motions in the Riksdag in 1991 proposed strong protection for the area. It was first named Nationalstadsparken Ulriksdal-Haga-Brunnsviken-Djurgården when it was formed in 1995, and the rules governing it are set out in the Swedish Environmental Code. In February 2009 the government decided on the name Kungliga nationalstadsparken, since much of the land consists of old royal parkland.

The park's name comes from its old royal parkland: Ulriksdal's baroque park, Djurgården's hunting park and the English parks at Haga-Brunnsviken, laid out in the 17th and 18th centuries. Fiskartorpet, inside the park, has long been central to Swedish skiing and outdoor life. Since 2013 the official entrance is the visitor centre at Djurgårdsvägen 2 on Södra Djurgården.

The park is spread over Stockholm, Solna and Lidingö, with Fjäderholmarna as its only part in Lidingö. Since 2013 the Royal Djurgården Visitor Center at Djurgårdsvägen 2 on Södra Djurgården serves as the official entrance. A 36 km signposted cycle route, opened in September 2010, links Ulriksdal in the north with Blockhusudden in the south.

The park's 27 km² hold northern Europe's largest stand of thick oaks, among them Prins Eugens ek, said to be Djurgården's largest living oak. In its waters lives the greenling, a freshwater fish endangered in Sweden. The 170-metre Kaknästornet, opened 1967, is its tallest structure.