Jacopo Dondi dell'Orologio (1290–1359), also known as Jacopo de' Dondi, was a doctor, astronomer and clock-maker active in Padua, Italy. He is remembered today as a pioneer in the art of clock design and construction. He was the father of Giovanni Dondi dell'Orologio. Jacopo Dondi wrote on a number of subjects, including surgery, pharmacology, astrology and natural science.