Lyndeborough /ˈlaɪndˌbʌroʊ/ is a town in Hillsborough County, New Hampshire, United States.

John Cram and his family were the first settlers and established a sawmill in the community in 1736.

[3] The name "Lyndeborough" resulted from a re-grant to a group of people that included Benjamin Lynde, who later became Chief Justice of Massachusetts.

For instance, while serving as a proprietor of Lyndeborough, Judge Lynde lived in Massachusetts, where he presided in Suffolk County over the trial stemming from the Boston Massacre.

The highest point in Lyndeborough is just shy of 1,800 feet (550 m) above sea level, where the east ridge of North Pack Monadnock Mountain crosses the town's western border.

The town is crossed by New Hampshire Route 31, which leads northwest into Greenfield and southeast into Wilton.