Darlington is an unincorporated community and census-designated place in northeastern Harford County, Maryland, United States.

Route 1 crosses the Susquehanna River at Conowingo Dam, 2 miles (3 km) northeast of Darlington.

According to the United States Census Bureau, the Darlington CDP has a total area of 1.05 square miles (2.72 km2), all land.

There are approximately 100 contributing properties, including buildings by architects such as Theophilus Parsons Chandler Jr. and Walter Cope.

[7] An annual apple festival is held in Darlington the first Saturday in October, and attracts almost 60,000 people.