Gilg is a surname. Notable people with the surname include:
Candice Gilg (born 1972), French freestyle skier Deborah R. Gilg (born 1951), American lawyer Ernest Friedrich Gilg (1867–1933), German botanist Karl Gilg (1901–1981), German chess player
See also Charlotte Gilg-Benedict (1872-1965), German botanist, wife of Ernest Friedrich