Alloa, a seaport town of Clackmannanshire, Scotland, 30 m. E. N. E. of Edinburgh, at the head of the frith of Forth; pop. about 7,000. It has an excellent harbor, and a dry dock capable of containing the largest ships; also a spacious wet dock opened in 1863. In the town and its vicinity are extensive collieries, distilleries, breweries, and iron, glass, brick, and tile works.