Harrisonburg is a village in and the parish seat of Catahoula Parish, Louisiana, United States. The population was 746 at the 2000 census.
Fort Beauregard, which is located a fourth of a mile outside the village, was a Confederate stronghold during the American Civil War. In 1863, the fort successfully defended Harrisonburg from the attack of four Union gunboats coming from the Black River to the Ouachita River. After four days of bombardment, little damage was done, and the gunboats retired down river.
The village of Harrisonburg formerly staged reenactments at Fort Beauregard, also known as Fort Hill, but those ceremonies ended in the late 20th century.