Lamoille County is a county located in the U.S. state of Vermont. As of the 2020 census, the population was 25,945, and it is the third-least populous county in Vermont. Its shire town is the town of Hyde Park, while Morristown is the county's largest town by population as well as its main commercial center. The county was created in 1835 from portions of Orleans, Franklin, Washington, and Chittenden Counties and organized the following year.

Hyde Park is a town in and the shire town of Lamoille County, Vermont, United States. The town was named for Captain Jedediah Hyde, an early landowner who was a veteran of the American Revolutionary War. The population was 3,020 at the 2020 census. There is also a village of the same name within the town.