Hall County sheriff's Sgt. Stephen Wilbanks said the jailer was fired after an internal investigation.
Sheriff's officials said the jailer struck a handcuffed inmate in the head with his hand.
Wilbanks tells The Times of Gainesville that criminal charges are possible, and the District Attorney's Office would decide whether they are filed.
Col. Tony Carter, chief deputy of the sheriff's office, said the jailer's actions are "completely unacceptable and do an extreme disservice to those we are sworn to protect, as well as those officers who serve honorably."
The sheriff's office has requested that the Georgia Bureau of Investigation conduct an independent investigation.