Henagar is a city in DeKalb County, Alabama, United States.

Henagar is located on top of Sand Mountain, a southern extension of the Cumberland Plateau.

[3] At daybreak on November 18, 1906, a Sunday, the Rainsville tornado struck the town, and all "fifteen stores and houses were reduced to splinters.

Alabama State Route 40 passes through the original center of town, leading east 8 miles (13 km) to Interstate 59 in Hammondville and west 19 miles (31 km) to Scottsboro.

Alabama State Route 75 crosses AL 40 in the newer commercial part of Henagar and leads northeast 8 miles (13 km) to Ider and southwest 10 miles (16 km) to Rainsville.

South Sauty Creek, a tributary of the Tennessee River, flows southwest through the central and southern part of the city.

As of the 2020 United States census, there were 2,292 people, 833 households, and 608 families residing in the city.

The Sand Mountain Potato Festival is celebrated each July in Henagar, with potatoes, live music, entertainment, arts and crafts, games, and fireworks.

Students are served by the DeKalb County Board of Education.

Henagar Junior High School, home of "The Wildcats", is located in the town.