Maryland Route 54 (MD 54) and Delaware Route 54 (DE 54) are adjoining state highways in the U.S. states of Maryland and Delaware. Route 54 runs from MD 313 in Mardela Springs, Maryland east to DE 1 in Fenwick Island, Delaware. In addition to two segments in which the highway is completely in Delaware and two segments in which the highway is completely in Maryland, Route 54 follows the Delaware/Maryland state line between the twin towns of Delmar, Maryland and Delmar, Delaware and the highway's intersection with MD 353 and DE 26. One section of the state line portion of Route 54 is maintained by the Delaware Department of Transportation (DelDOT) while three sections of the highway that follow the state line are maintained by the Maryland State Highway Administration (MDSHA).