Mary D is an unincorporated community and coal town in Schuylkill County, Pennsylvania, United States. It is located in Schuylkill Township on U.S. Route 209 and the Schuylkill River forms its natural southeastern boundary.
The community derives its name from Mary Delores Dodson, the wife of a local mine owner.
The United States Census Bureau defined MaryD as a census designated place (CDP) in 2023.