Rapidan River

The Rapidan River, flowing 88 miles (142 km) through north-central Virginia in the United States, is the largest tributary of the Rappahannock River. The two rivers converge just west of the city of Fredericksburg. The Rapidan River begins west of Doubletop Mountain in Shenandoah National Park where the Mill Prong meets the Laurel Prong at Rapidan Camp, approximately 3 miles (4.8 km) south of Big Meadows. The river defines the border of Orange County with Culpeper and Madison Counties.

The Rapidan River was the scene of severe fighting in the American Civil War, and historic sites such as Ely's Ford, Chancellorsville, Brandy Station, Kelly's Ford, and the Battle of the Wilderness are nearby.

The name is a combination of the word "rapids" with the name of Queen Anne of England. Originally, it was known as the Rapid Ann River.