Scaggsville is an unincorporated community and census-designated place in Howard County, Maryland, United States. It is situated near the southeastern tip of Howard County, between Laurel and Fulton. The town mainly consists of residences, with some commercial establishments. Scaggsville generally falls within ZIP code 20723, assigned to Laurel, though the town formerly had its own post office.

At the 2000 census the Scaggsville area was counted as part of the North Laurel census-designated place.

The town is named for the Scaggs family, who settled 700 acres (2.8 km²) of farmland in the 1830s and continue to live in the region. The area also used the name "Hells Corner" as a postal address in Civil War times. The historic path running through town was shown on maps as far back as 1795. This path is now named Lime Kiln Road, Scaggsville Road, and Whiskey Bottom Road. In the 19th century, Scaggsville was a stagecoach stop on the trip from Washington, D.C., to Baltimore. Stagecoaches would ford the Patuxent River until a wooden bridge was built in 1859, which washed out in an 1868 flood. Three additional bridges washed out by 1883 before a steel truss bridge was built. In 1941, the Maryland Gazette reported that the town consisted of 15 households. Today, it has grown to a suburban community made up of several neighborhoods.

Scaggsville is located in southern Howard County, bordered by Fulton to the west, Columbia to the north, North Laurel to the southeast, West Laurel in Prince George's County to the south, and Burtonsville in Montgomery County to the southwest. The Patuxent River forms the southern edge of the Scaggsville CDP, as well as the Howard County line. U.S. Route 29 follows the western edge of the CDP, leading north 5 miles (8 km) to Columbia and south 19 miles (31 km) to downtown Washington, D.C. Interstate 95 forms the eastern edge of the CDP, leading northeast 18 miles (29 km) to downtown Baltimore and southwest 9 miles (14 km) to Washington's Beltway. Maryland Route 216 runs east–west through the center of Scaggsville, connecting US 29 and I-95, and leads 4 miles (6 km) southeast to Laurel.

As of the 2020 census, Scaggsville had a population of 9,217. The median age was 42.7 years. 23.5% of residents were under the age of 18 and 15.9% of residents were 65 years of age or older. For every 100 females there were 96.7 males, and for every 100 females age 18 and over there were 93.9 males age 18 and over.

100.0% of residents lived in urban areas, while 0.0% lived in rural areas.

There were 3,084 households in Scaggsville, of which 38.4% had children under the age of 18 living in them. Of all households, 72.7% were married-couple households, 7.8% were households with a male householder and no spouse or partner present, and 16.3% were households with a female householder and no spouse or partner present. About 13.5% of all households were made up of individuals and 6.3% had someone living alone who was 65 years of age or older.

There were 3,127 housing units, of which 1.4% were vacant. The homeowner vacancy rate was 0.4% and the rental vacancy rate was 2.4%.