Cedergrenska tornet, Brick castle in Danderyd Municipality, Sweden.

Cedergrenska tornet is a red-brick tower begun in 1896 on the highest point of Albert Gotthard Nestor Cedergren's plot in Stocksund. It was built in a romanticised medieval style using old construction methods, with architects Ferdinand Boberg, Erland Heurlin and Lars Israel Wahlman involved. The exterior was finished in 1908, while the interior was completed only in 1994–1996.

Albert Gotthard Nestor Cedergren, the first buyer of land from Stockby AB, began the tower in 1896 on the highest point of his plot. Ferdinand Boberg, Erland Heurlin and later Lars Israel Wahlman worked on it; the exterior was finished in 1908, but the interior was still unfinished when Cedergren died in 1921. His daughters Vera and Naja left the tower and its botanical garden to Skogshögskolan in 1975, which passed it to Nordiska museet; Danderyds kommun bought it in 1981 and completed it in 1996.

The tower is a symbol of Stocksund: Stocksunds IF has long used an image of it in its emblem, with permission granted by Cedergren himself, who also supported the club. On Sundays, brunch is served in the large knight's hall, and at Christmas a julbord is held in the decorated tower.

The tower can be rented for events such as conferences, weddings, and celebrations, with support available for event planning. Its location within a wooded setting provides a quiet environment for gatherings.

A sealed casket is walled into a secret spot inside the tower. It is a time capsule placed there by the organisers who completed the construction in 1996, and it is not to be opened until 21 April 2096, when the tower turns 200.