Guglielmo Botti (December 9, 1829 – after 1906) was an Italian dresser and restorer. He was born in Pisa. He trained under Tommaso Gazzarrini in Pisa, and Giuseppe Bezzuoli in Florence. He trained as an artist of stained glass, closely studying Italian stained glass from the 14th and early 15th century to discover their techniques. He did so well that he was, erroneously, credited for rediscovering "the ancient manner" of painting on glass. He was sponsored by Leopold II, Grand Duke of Tuscany, developing new stained-glass techniques. He avoided a composition of many separate pieces of colored glass by keeping the lead lines to a minimum and painting directly on the larger panes of glass with many colors of enamel pigments. Shortly afterwards he was asked (together with Tito Gordini) by pa