The Grey House (Danish: Det Grå Hus) is a listed building in the Carlsberg area of Copenhagen, Denmark.

It was acquired by Carl Jacobsen in connection with his foundation of the Ny Carlsberg Brewery.

In 1901, Hack Kampmann altered the building and created an extension on its north side which doubled its floor area, adding a vestibule, offices and a laboratory.

[1] The building is constructed in yellow brick with sandstone bands around the windows.

Ny Carlsberg's trademark and Carl Jacobsen's motto, Semper ardens, are seen above the door.