Hammarskog, Manor house in Uppsala Municipality, Sweden

Hammarskog is a manor house in Uppsala that bridges traditional country estates and modern residential forms. The building combines classical Swedish architectural elements with contemporary improvements, set within a landscape that incorporates water features.

The estate was called Hammarby until the 17th century; Uppsala Cathedral's building fund held land here in 1344. In 1562 Gabriel Kristiernsson Oxenstierna is named owner, and his son Krister Gabrielsson Oxenstierna made Hammarskog a manor. The present main building was completed in 1655; a fire in the late 18th century destroyed its upper floors, which were demolished and the roof lowered.

The name Hammarskog replaced Hammarby only in the 17th century; the estate was still called Hammarby when Klara Ray and Nils Petersson wrote themselves there in the 1370s–90s. The manor house now holds a café and restaurant, and the grounds form part of Hammarskogs naturreservat, with many paths between Dalbyviken and Näsdalen.

The manor stands by a bay of Lake Ekoln, within Hammarskog nature reserve, where many trails run between Dalbyviken and Näsdalen. The building itself holds a café and restaurant, so walkers can combine the paths with a stop indoors.

The manor's name was Hammarby until the 17th century; Uppsala Cathedral's building fund held land here in 1344. In 1470 Gregers Bengtsson complained that followers of Erik Karlsson had plundered the farm and stolen its brewing cauldrons.