Dalzell House is a historic house in Motherwell, North Lanarkshire, Scotland. It is located to the south of the town, on the north bank of the River Clyde. At its core is a 15th-century tower house, with extensive additions built during the 17th and 19th centuries. In the 1980s the house was restored and divided for sale as eighteen private apartments, while the surrounding Dalzell estate is now owned by North Lanarkshire Council. The house is protected as a Category A listed building, and the grounds are listed on the Inventory of Gardens and Designed Landscapes in Scotland.
Dalzell House is said to be haunted by three ghosts: a green lady, a white lady, and a grey lady. The green lady haunts the south wing: a young boy babbled that he saw her walking out from a passage; security guards at a time when the house was empty heard noises and saw her briefly; and guard dogs bark into empty room where she walks. The white lady walks around the whole house, and a number of rumours were told about her. One story said she was a maid who jumped off the battlements in the grounds, and another said she was walled up. The grey lady was said to be a nurse from the First World War period when the house was used as a hospital for wounded soldiers.