BUSTO ARSIZIO, a town of Italy, in the province of Milan and district of Gallarate, about 19 miles N.W. of the city of Milan by rail. Its church of Santa Maria was planned by Bramante, and contains frescoes by Gaudenzio Ferrari; and St John's is also a noble building. Cotton is manufactured in the town, and the vine is cultivated in the neighbourhood. Population in 1870, 12,909.