Lisbon is a town in Grafton County, New Hampshire, United States. The population was 1,587 at the 2000 census. Lisbon hosts an annual "Lilac Festival" on Memorial Day weekend. The primary settlement in town, where over 67% of the population lives, is defined as the Lisbon census-designated place (CDP) and is located along U.S. Route 302 and the Ammonoosuc River in the southwestern corner of the town.