Architect. Born in Edinburgh into a family of noted architects, he was the great-grandson of Robert Mylne (1633 - 1710), the son of Thomas Mylne (d.1763) and brother of William Mylne (1734-90). Mylne was raised at Powder Hall in Edinburgh, but studied in Paris and Rome. He built Blackfriars Bridge in London, with its controversial elliptical arches, and canals in England. His buildings include Stationers Hall (London) and St. Cecilia's Hall in Edinburgh's Cowgate (1765). He was also partially responsible for re-building the village of Inveraray for the Duke of Argyll and worked on Inveraray Castle in the 1780s. Mylne was a rival to Robert Adam, but could not match Adam's genius or success.
Mylne lies buried in St. Paul's Cathedral, London.