Gilbert Murray Simpson friba (1869–1954) was a British architect from Brighton who did most of his work in the seaside resort. In 1890 Simpson joined his father Thomas, architect to the Brighton and Preston School Board and the Hove School Board, and helped to design some of the "distinguished group of board schools" for those institutions during the late 19th century. He took over the firm of Thomas Simpson & Son when his father died in 1908, and went on to design several other institutional buildings in Brighton. His elder brother Sir John William Simpson was also an architect.