Glyndon, Maryland is an unincorporated community in Baltimore County, Maryland, United States. Founded in 1871 by Dr. Charles A. Leas, the village is located in the northwest section of Baltimore County and is primarily a residential suburb of metropolitan Baltimore City. The village is characterized by the predominance of historic Victorian homes and a strong sense of community among its residents. Glyndon is listed on the National Register of Historic Places (1973) and on the Maryland Inventory of Historic Properties (1973); the Glyndon Historic District was also designated as the first historic district in Baltimore County (1981).
Also listed on the National Register of Historic Places is the Worthington Valley Historic District.