The UH-60 Black Hawk went down late Saturday evening, the military said. The cause is under investigation, but it is not believed to have been due to enemy fire, the military said in a short statement.
The name of the soldier killed was being withheld pending notification of next of kin.
An Iraqi army officer from the area said the helicopter went down amid rainy and windy weather near Saddam Hussein's hometown of Tikrit. Another Iraqi army officer said the helicopter crashed in the Al-Mahzam area, about 12 miles (20 kilometers) north of Tikrit.
They both spoke on condition of anonymity because they were not officially authorized to discuss the case.
The Black Hawk is the military's mainstay transport helicopter in Iraq. It is designed to carry up to four crew members and a fully equipped infantry squad of 11, but it was not clear how many people were aboard the aircraft that crashed.
The military also did not immediately say what mission the helicopter was on when it crashed.
It follows the February crash of a helicopter on a base in northern Iraq that killed two Army pilots.
With Saturday's death, at least 4,391 members of the U.S. military have died in the Iraq war since it began in March 2003, according to an Associated Press count.