Dalénum, Residential district in Lidingö Municipality, Sweden

Dalénum is a former AGA industrial site in Skärsätra, Lidingö, being redeveloped into housing and offices. The preserved factory blocks from 1912 include the machine workshop with its sawtooth roof, the accumulator workshop, the oxygen station and the gatehouse. The 22-storey Fyrtornet Dalénum, completed in 2020, is Lidingö's tallest building.

The site was home to AGA's industrial operations until 1937, where inventor Gustaf Dalén created innovations that gave the area its current name. Following the end of manufacturing, the grounds were transformed into a mixed residential and commercial development while key structures were preserved.

The name Dalénum honours Gustaf Dalén, AGA's head from 1912 to 1937. Blocks and streets carry the company's vocabulary: kvarteren AGA, Solventilen, Agaspisen and Geodimetern, and gatorna Agavägen, Optikvägen, Radiovägen, Prismavägen and Ackumulatorvägen. The 1956 staff canteen, Sjövillan, is to become a restaurant.

The area connects to Stockholm via the Lidingöbanan tram at AGA station, with ferry service and bus lines also available for reaching the district. These multiple transport options make it straightforward to visit and explore the waterfront location from different directions.

The 22-storey Fyrtornet Dalénum, completed by JM in 2020, is Lidingö's tallest building and the district's new landmark, designed by Wingårdh arkitektkontor. It stands in Strandparken, the section closest to Lilla Värtan, where detached point blocks are set among planted courtyards.