Highland Lake[1] is a 697-acre (2.82 km2)[2] water body located in Sullivan and Cheshire counties in southwestern New Hampshire, United States, in the towns of Washington and Stoddard.

The northern end of the lake is only accessible by boat through a channel approximately 50 feet wide.

Most of the lakeside real estate has seasonal and year-round residences situated on plots of land smaller than .25 acres.

The Highland Lake Marina (the waterway's only such establishment) is located at the end of Shedd Hill Road.

It is open during summer weekends, and offers boat storage, docking, and recreational merchandise.