The sentence on Friday for Sergeant Javal Davis was in accordance with a deal he struck with prosecutors in which he had agreed to plead guilty to dereliction of duty, making a false official statement and battery, the Killeen Daily Herald reported.
The sentence came after six hours of deliberation by a military jury.
Davis stood at attention as the sentence was read, the daily said.
"I'm extremely disappointed," Paul Bergrin, Davis' civilian lawyer, said. He said he would appeal against the sentence.
Officials at Fort Hood could not be reached for comment on Saturday.
Davis was a military policeman who worked as a guard at Abu Ghraib prison for three months in late 2003.
He is among seven soldiers facing charges in the abuse scandal at Abu Ghraib. Several haunting pictures of the abuse showed naked and injured Iraqi prisoners alongside smiling American soldiers. The photographs sparked international outrage.
Davis is one of seven soldiers
accused of abusing prisoners
In the first court-martial in the prison scandal, Army Specialist Charles Graner was sentenced last month to 10 years in prison for physically and sexually mistreating Iraqis.
Four others accused in the abuse have pleaded guilty to various charges.