Broad Run is a tributary of the Potomac River in Loudoun County, Virginia.

The creek flows eastward near Arcola and continues generally northeast to its mouth at the Potomac near the southern end of Seldon's Island to the north of Sterling and about 10 miles (16 km) southeast of Leesburg.

[3] The majority of the run forms the border between the unincorporated areas of Ashburn and Sterling.

The Broad Run Bridge and Tollhouse is a national listed historic site.

The creek should not be confused with the nearby Broad Run (a tributary of the Occoquan River) that flows through Fauquier and Prince William Counties.