Glen Historic District is a national historic district located at Glen in Montgomery County, New York. It includes 52 contributing buildings and two contributing sites. The district encompasses the historic core of a rural crossroads hamlet. The majority of the structures are one and one half or two story, timber framed buildings with gable roofs. At the crossroads are the most distinguished buildings: two large Federal style residences, a mid-19th century general store, and a distinguished, Second Empire style brick residence built in 1878.