Marydel is an incorporated town in Caroline County, Maryland, United States. The population was 141 at the 2010 United States Census. Its name is a portmanteau, after its location, being partially located in Maryland and partially in Delaware. Marydel was originally known as Halltown.

Caroline County is a rural county located in the U.S. state of Maryland on its Eastern Shore. As of the 2020 census, the population was 33,293. Its county seat is Denton.