The central criminal court in Baghdad found 40 of 47 defendants guilty of involvement in the "Speicher" massacre, named after the base near where the victims were captured before being executed.
"The court ordered the execution of 40 (people) convicted of involvement in the incident, while seven were released for lack of evidence," the spokesman for Iraq's judiciary, Abdel Sattar Bayraqdar, said in the statement.
He did not say how many were present at the trial and provided no details on each defendant's involvement in the Speicher massacre, nor on the circumstances of their arrest.
In a similar trial in July 2015, 24 men were sentenced to hang over the Speicher massacre, which was committed during the first days of the Islamic State group's broad offensive in Iraq.
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All of them had denied involvement. Some had said they were not even near Tikrit at the time, others that they never saw a lawyer and that the confessions used to secure convictions were obtained under torture.
The highest estimate for the number of men murdered in the Speicher massacre is 1,700. Tikrit was retaken from IS in April 2015.