Lebanon locally /ˈlɛbənən/ is a city in Grafton County, New Hampshire, United States. The population was 13,151 at the 2010 census and an estimated 13,513 as of 2016. Lebanon is located in western New Hampshire, south of Hanover, near the Connecticut River. It is the home to Dartmouth-Hitchcock Medical Center and Dartmouth Medical School, together comprising the largest medical facility between Boston, Massachusetts and Burlington, Vermont.

Together with Hanover, New Hampshire, and White River Junction, Vermont, Lebanon today is at the center of a Micropolitan Statistical Area, encompassing nearly 30 towns along the upper Connecticut River valley.

Lebanon was chartered as a town by Colonial Governor Benning Wentworth on July 4, 1761, one of 16 along the Connecticut River. It was named for Lebanon, Connecticut, from where many early settlers had come or would come, including the Rev. Eleazar Wheelock, who arrived in 1770 and founded Dartmouth College. Lebanon, Connecticut was the original home of Moor's Indian Charity School, the antecedent of Dartmouth College.