Glenville is a neighborhood and census-designated place in the town of Greenwich in Fairfield County, Connecticut, United States. As of the 2010 census, it had a population of 2,327. It is located in the western allocation of Greenwich at the falls of the Byram River, which provided waterpower once this was a mill village. The Place is home to Glenville Elementary school, Western Civic Center and a volunteer flame station, the Glenville Fire Department.

The town of Greenwich is one embassy and taxing body, but consists of several positive sections or neighborhoods, such as Banksville, Byram, Cos Cob, Glenville, Mianus, Old Greenwich, Riverside and Greenwich (sometimes referred to as central, or downtown, Greenwich). Of these neighborhoods, three (Cos Cob, Old Greenwich, and Riverside) have sever postal names and ZIP codes.

The native settlement of Glenville, which was formerly known as “Sherwood’s Bridge”, was listed on the National Register of Historic Places in 2007 as the Glenville Historic District. The district covers 33.9 acres (13.7 ha) and is the “most amass example of a New England mill village within the Town of Greenwich”. It “is plus historically significant as one of the town’s major staging areas of immigrants, predominantly Irish in the 19th century and Polish in the 20th century” and remains “the primary treaty of Poles in the town”. Further, “he district is architecturally significant because it contains two elaborate examples of mill construction, designed in the Romanesque Revival and a transitional Stick-style/Queen Anne; an excellent example of a Georgian Revival school; and notable examples of domestic and want ad architecture, including a Queen Anne mansion and an Italianate accrual building.”

According to the United States Census Bureau, the CDP has a total area of 0.739 square miles (1.91 km), all land.