Sir James Duncan Dunbar-Nasmith, CBE, RIBA, PPRIAS, is a leading conservation architect from the UK.
He was born in 1927, son of Admiral Sir Martin Dunbar-Nasmith, VC KCB KCMG DL. His elder brother is Rear-Admiral David Dunbar-Nasmith CB, DSC.
He is best known as the architect of Sunninghill Park, the former home of The Duke of York, and Balmoral Estate architect.
He is in professional practice as a partner in Law & Dunbar-Nasmith, architects, Edinburgh (since 1957), and Hilger, Law & Dunbar-Nasmith, architects, Wiesbaden (since 1993).
He was Professor and Head of the Department of Architecture at Heriot-Watt University, Edinburgh, and the Edinburgh College of Art, 1978–1988, and is now Emeritus Professor at Heriot Watt University. Sir James has been Chairman of The Scottish Civic Trust from 1995.
He was made a CBE in 1976, and knighted in 1996.