Dundas House is a Neoclassical building in Edinburgh, Scotland. It is located at 36 St Andrew Square, in the city's first New Town. The building was completed in 1774 as a private town house for Sir Lawrence Dundas by the architect Sir William Chambers. Much altered internally and extended over the years, today it is the registered office of the Royal Bank of Scotland and its parent, NatWest Group and is protected as a category A listed building.