Overlea /ˈoʊvərˌliː/ is an unincorporated community and census-designated place in Baltimore County, Maryland, United States.

[3] According to the United States Census Bureau, the CDP has a total area of 3.1 square miles (8.0 km2), all land.

Overlea first started out as a 43-acre tract, owned by Margaret Fuller (Fullerton, Maryland, is named for her most likely).

Kennard Land company mapped out the streets as: Spruce, Ash, Cedar, Maple, Hickory, Chestnut, Walnut, Willow, Beech, Poplar, Elm and Linden.

In 1910, a "town hall" was built on the Corner of Overlea Avenue and Belair Road, and still stands there today as the Natural History Society of Maryland.

On February 23, 1913, a group of suffragists called "The Army of the Hudson" stopped at the town hall on their way from New York City to the march organized in Washington, D.C., by the National American Woman Suffrage Association.

In the same year, St. Michael's Roman Catholic Church held its first mass in the town hall.

26.9% of all households were made up of individuals, and 12.0% had someone living alone who was 65 years of age or older.