a town of the United States, North America, in New Hampshire, situated at the confluence of the Nashua and Merrimack rivers, 31 miles S. by E. of Concord, and 40 N.N.W. of Boston. It has seven churches, three newspaper offices, and a bank. The River Nashua affords a great amount of water-power for machinery; it has a fall of 65 feet in 2 miles, and at the driest season discharges a volume of 180 cubic feet per second. Its waters are connected with those of the Merrimack by means of a canal. Nashua is remarkable for its manufacturing industry. The total value of the capital invested in various manufactures is about £80,000, and the number of hands employed 2300. Cotton is the principal article produced. Machinery, iron, &c., are also manufactured here. The town is connected by railways with the principal towns of New England. Pop. 5820.