William Leiper FRIBA RSA (1839-1916) was a Scottish architect notable particularly for his domestic architecture in and around the town of Helensburgh. In addition, he produced a small amount of fine ecclesiastical and commercial architecture in Glasgow and the Scottish Lowlands. He was also an accomplished watercolour artist, and in the late 1870s, took a break from architecture to pursue painting. He lived the last 40 years of his life in Helensburgh, at 'Terpersie', and died there on 27 May 1916.