Stark is a town in Coös County, New Hampshire, United States. The population was 478 at the 2020 census, a decline from the figure of 556 tabulated in 2010. It has a famous covered bridge. The town includes the villages of Percy and Crystal as well as the village of Stark, located on the Upper Ammonoosuc River. New Hampshire Route 110 runs through Stark, east from U.S. Highway 3 in Groveton and northwest from Route 16 in Berlin. Much of the town is within the boundaries of the White Mountain National Forest.

Coös County or Coos County is a county in the U.S. state of New Hampshire. As of the 2020 census, the population was 31,268, making it the least-populated county in the state. The county seat is Lancaster.