Francesco (Maurizio)
di Giorgio Martini (1439-1501?),
Italian artist, whose versatile output—paintings, sculpture, architecture, and military fortifications—made him a dominant figure of late 15th-century art in Siena.

His most important work (aside from unsubstantiated contributions to the Ducal Palace of Urbino) is the octagonal-domed Church of Santa Maria del Calcinaio (1485), near Cortona, one of the most perfect of 15th-century churches; its proportions are strongly indebted to the dome of Florence Cathedral, by the earlier Florentine master Filippo Brunelleschi.

Later artists were influenced by Francesco's paintings, such as The Nativity (1475, Pinacoteca, Siena) and sculptures. During his later years Francesco wrote Treatise on Civil and Military Architecture (1492).