The Hill House in Helensburgh, Scotland, was created by architects and designers Charles and Margaret Macdonald Mackintosh. The house is an example of the Modern Style (British Art Nouveau style). It was designed and built for the publisher Walter Blackie in 1902–1904.

Mackintosh also designed the house interior, including furniture and fittings. In 1982, the house was donated to the National Trust for Scotland, which maintains and opens the house to visitors.

The house is currently inside a cage to protect it from the elements, this does however, allow visitors to view the building from above and to appreciate the beauty and simlicity of the design. Though a beautiful building it sadly suffers from numerous design flaws and limitations with the construction materials.