Crews were called to the scene at approximately 4 p.m. on the 1100 block of the boardwalk at the Resorts Casino.
According to officials, the flames began underneath the boardwalk and spread upward into the casino.
Video from the scene shows large plumes of smoke and flames coming from inside the building.
Viewer video shows large fire on the Atlantic City Boardwalk
Firefighters were able to put out the blaze.
It is unclear if there are any injuries at the scene.
The cause of the fire remains under investigation.