Merlo Castle, Historical residence in Timrå District, Sweden.

Merlo Castle is a three-story manor house with 18 rooms in Timrå Municipality, Sweden. The building sits within a park containing rare trees and plants, and its upper floor features a hall with a very high ceiling designed in a style inspired by medieval architecture.

Fredrik Bünsow, a timber merchant from Stockholm, had the castle built between 1883 and 1885 as a summer home for his family. After roughly 40 years as a private residence, the property changed hands and eventually became the home of a regional industrial archive.

The building has served as SCA's central archive since 1951, when the company moved its records into the former residence for lack of other premises. The modernist annex holding part of the archive was added in 1961 to designs by Axel Grönwall. The archive is a working facility, not a public museum, so access is not open to visitors.

The building is a private archive and not open to visitors; the park and its winding paths and ponds can be seen from outside. The 1961 archive extension by Axel Grönwall stands beside the 1880s villa, so both phases of the site are visible from the grounds. The garden master's house, inspired by north Italian Renaissance villas, also survives near the park.

The 1961 modernist extension by architect Axel Grönwall was added specifically to house part of SCA's central archive, so the castle's working archive spills into a building of its own. The main villa kept its original appearance, with oak panelling, doors and ceiling inlays intact.