Mockingbird Creek is a long 2nd tributary to Barren Creek in Wicomico County, Maryland.
Mockingbird Creek rises about 0.25 miles northeast of Susan Beach Corner in Sussex County, Delaware and then flows west-southwest into Wicomico County, Maryland to join Barren Creek about 1.5 miles west of Mardela Springs.
Mockingbird Creek drains of area, receives about 44.5 in/year of precipitation, has a topographic wetness index of 707.04 and is about 14% forested.