Amersfoort, a town of the Netherlands, in the province of Utrecht, with a port on the river Eem, about 10 m. from its mouth in the Zuyder-Zee, and 12 m. E. N. E. of Utrecht; pop. in 1867, 13,258, nearly half Roman Catholics. It has manufactories of cotton and woollen stuffs, an industrial school, a Latin school, and a Jansenist seminary. Corn and tobacco are cultivated very extensively in the vicinity, and a brisk trade is carried on.