Addressing the commemoration, Croatian President Stjepan Mesic said that attempts to criticise anti-Fascism with the purpose of revisionism of the Second World War would fail.
Mesic said that recent weeks had seen "the wild behaviour of those who cannot accept some obvious historical facts" and who, he said, were trying to discredit anti-Fascist fighters and victims of Fascism.
Describing those attacks as "cheap political theatre", Mesic said they were dirty and primitive.
Mesic said that being the president of a country whose Constitution includes anti-fascism as the pillar of the society he could not allow attacks against anti-Fascism and anti-Fascist fighters who he said had fought "for freedom and for freedom only".
The Ustasha regime was criminal in its essence and in its ideas as well as in the implementation of those ideas, but the regime established after the Second World War, although inflexible and authoritarian, was not criminal, Mesic said.
Commenting on the role of Josip Broz Tito, Mesic said that Tito was not a criminal, although "there are serious things for which he could be blamed."
Deputy Prime Minister Jadranka Kosor said that the Croatian government condemned in the strongest terms crimes committed in Jasenovac during the Ustasha regime, which she labelled as "an evil regime".
"In the same way, we condemn any crime regardless of the time and place of its perpetration," Kosor said.
Other speakers at the commemoration, including representatives of the Croatian parliament and surviving camp prisoners, stressed that Croatia was founded on the values of anti-Fascism and that crimes should not be allowed to sink into oblivion because remembering them would prevent their recurrence.
Prayers were said by dignitaries of major religious communities in Croatia and wreath-laying ceremonies were held as part of today's commemoration.
The Jasenovac camp was the largest concentration camp set up by the Ustasha regime in the second half of 1941. According to the latest figures, 75,923 victims executed in the camp have been identified.