George Mackie Watson RIBA (1860–1948) was a Scottish architect in the late 19th and early 20th centuries. He trained in the offices of Robert Rowand Anderson, and was responsible for the design and reconstruction of several churches. From 1912 to 1932 he was involved in the total rebuilding of Eilean Donan Castle on the west coast of Scotland, for John Macrae-Gilstrap.