Margaret Justin Blanco White

(Margaret) Justin Blanco White OBE ARIBA (11 December 1911 – 1 November 2001) was a Scottish architect.

Her father was George Rivers Blanco White KC, and her mother the writer Amber Reeves. Her brother was Thomas Blanco White, an intellectual property lawyer.She married biologist Conrad Hal Waddington in 1936.They had two daughters, Caroline (married name Humphrey, subsequently Dame and Lady Rees, 1943–), an anthropologist, and Dusa (married name McDuff, 1945–), a mathematician.

Blanco White trained at the Architectural Association School of Architecture.

She worked on low cost housing, housing for the elderly, and hospitals when she was Superintending Architect of the Scottish Office.In the 1973 Birthday Honours she was appointed an OBE for her work.

Justin Blanco White designed Shawms, Conduit Head Road, Cambridge in 1938. The building was listed Grade II in 1996, and is built in the Modernist style, although using timber as a facing material.

Also attributed to Blanco White is 12 Landsdowne, Cambridge, built 1961-1968 in collaboration with David Croghan. Commissioned by Pat Merton in 1958, the building was demolished in 2003 according to the condition of sale to its new owners.