Lutherville-Timonium is a census-designated place (CDP) in Baltimore County, Maryland made up of the unincorporated communities of Lutherville and Timonium. The population was 15,814 as of the 2000 census. Within its borders lies the Lutherville Historic District. The Maryland State Fair is held in Timonium each year near Labor Day.
Lutherville-Timonium is located at 39°26′11″N 76°37′6″W / 39.43639°N 76.61833°W / 39.43639; -76.61833 (39.436456, -76.618461).
According to the United States Census Bureau, the CDP has a total area of 7.4 square miles (19.1 km²), all of it land.