Guildhall is a town in and the shire town of Essex County, Vermont, United States. As of the 2020 census, the population was 262. According to a large sign in the town center, it is the only town in the world so named. The name derives from a meeting house on the square called the Guildhall.

Essex County is a county located in the northeastern part of the U.S. state of Vermont. As of the 2020 census, the population was 5,920, making it the least-populous county in both Vermont and New England. Its shire town is the municipality of Guildhall. The county was created in 1792 and organized in 1800. Bordered by the Connecticut River next to New Hampshire, Essex County is south of the Canadian province of Quebec. It is the county with the lowest household-income in Vermont.