Awarding both individual and collective damages, the court also found that Katanga, serving a 12-year term for war crimes, was liable for one million dollars of the total damages estimated at $3.7 million.
Order for reparations for victims of former Congolese warlord Germain Katanga is set to be a landmark step for the tribunal, set up in 2002 to prosecute the world's worst crimes.
Katanga was sentenced by the ICC to 12 years in jail in 2014, after being convicted on five charges of war crimes and crimes against humanity for the February 2003 ethnic attack on Bogoro village in Ituri province.
He was accused of supplying weapons to his militia in the attack in which some 200 people were shot and hacked to death with machetes.
Legal representatives have estimated a minimum of $16.4 million in damages was caused, and it may be as high as $24.7 million, even if the "victims are not demanding this sum".
Katanga, 38, now on trial in the Democratic Republic of Congo on other charges of war crimes and insurrection in the mineral-rich Ituri region, is liable to pay any compensation.