William Burn (20 December 1789 – 15 February 1870) was a Scottish architect, pioneer of the Scottish Baronial style.
He was born in Edinburgh, the son of architect Robert Burn, and educated at the Royal High School. After training with the architect of the British Museum, Sir Robert Smirke, he returned to Edinburgh in 1812. Here he established a practice from the family builders' yard. In 1841, he took on a pupil, David Bryce, with whom he later went into partnership. From 1844 he worked in London, wher he took on his nephew John Macvicar Anderson as a partner.
Burn was a versatile architect who was happy to turn his hand to a variety of styles. He designed many Scottish churches, a castle and some important public buildings, including: