Black Lake Bayou is a 105-mile-long (169 km) waterway in northwest Louisiana, United States, that extends from north of Gibsland and travels south to Clarence. The watershed covers much of northwest Louisiana. The bayou meanders its way through Claiborne Parish, Webster, Bienville, Red River and Natchitoches parishes. Black Lake Bayou empties into Black Lake, which drains to Saline Bayou, a tributary of the Red River.