The Taoiseach Mr Ahern believes Ireland's presidency of the EU, which passed to The Netherlands at midnight last night, was successful.
"I believe that our sixth Presidency of the European Council will be regarded as a successful one," Mr Ahern said.
Mr Ahern, speaking today at the launch of Report on Ireland's Presidency of the European Union, said: "We can look back over the six months with some pride at what we have achieved as Europeans working together."
The report said that the European Union "has made considerable progress in all the priority areas identified at the outset of the [Irish] Presidency."
"As the last six months have shown, 'Europeans -Working Together' can build a better Europe and contribute to a fairer, more secure and more peaceful world," it concluded.
The Taoiseach, who relinquished his position as President of the European Council, said the successful outcome of negotiations on the EU constitution "marked a milestone in the development of the European Union.
"Each participant could justifiably claim the European Constitution as their own," he said.
Describing the "complex and critical negotiations" as a "classic European Union exercise", Mr Ahern said: "Our collective success was particularly noteworthy as this was the first major test of our new enlarged union of twenty-five and more".
The constitution had proved to be a "win-win solution for all the member states and for the people of Europe," he added.
Mr Ahern has been widely complimented for his handling of the negotiations, which collapsed under the Italian presidency, which preceded Ireland's.
The next European Commisssion president, Portuguese prime minister Mr Jose Manuel Durao Barosso, summed up the Irish presidency minutes after accepting the Commission job on Tuesday night in Brussels. "We have reached the end of an Irish presidency that will live in our memories as a great presidency. What a great job Bertie has done," he said.
Outgoing Commission president Mr Romano Prodi said: "Hats off to Bertie. He has been a leader in another real success story for Europe."
Opposition parties took the opportunity in the Dáil to compliment Mr Ahern and the Government on their handling of the presidency. "The Taoiseach's rare achievement is a testament to his negotiation skills which, we are told, are legendary," Fine Gael leader Mr Enda Kenny said.
Labour Party leader, Mr Pat Rabbitte said getting agreement on the treaty and the presidency of the European Commission "in the midst of a remarkable degree of rancour between various heads of government are noteworthy and are deserving of unbegrudging congratulations".