Hyannis is a village in Grant County, Nebraska, United States. The population was 287 at the 2000 census. It is the county seat of Grant County.
Hyannis is located at 42°0′3″N 101°45′55″W / 42.00083°N 101.76528°W / 42.00083; -101.76528 (42.000817, -101.765202).
According to the United States Census Bureau, the village has a total area of 0.7 square miles (1.8 km²), all of it land.