The Government's Dáil motion which included allowing the US military continued use of Irish airspace and landing facilities has been passed today by 77 votes to 60.
Earlier, there was a lively debate from all sides of the house about the use of Shannon Airport by the US Air Force and Ireland's neutrality.
The Minister for Foreign Affairs, Mr Brian Cowen told the Dáil debate on the crisis in Iraq today, that the provision of over-flight and landing facilities at Shannon did not change Ireland's general policy of military neutrality.
Mr Cowen said that if Ireland were to withdraw the use of facilities at Shannon Airport "we would be in danger of being perceived by members of the coalition as in a sense siding - at least psychologically - with Saddam".
He also said the Government has consistently opposed the use of force, except as a last resort after all other possible means have been tried and failed.
"Ireland has repeatedly stated its view that if Iraq continued in its non-compliance, a second Security Council resolution should be adopted. We believe that this is what should have been done," Mr Cowen said.
Mr Cowen added: "In 1990/1991, the then government made clear the position that the extension of over-flight and landing facilities at Shannon did not give rise to any question of Ireland's declaring war or participating in a war in the Persian Gulf.
"The Government has decided that it will continue to make these peripheral facilities available. This does not change our general policy of military neutrality. Ireland will not participate in this conflict and we have undertaken no commitments."
The Taoiseach, Mr Ahern, the first speaker in the debate, told the Dáil that refusing to allow the continued US military use of Irish aviation facilities would be regarded as a "hostile act".
He said to change the long-standing agreement with the US military would be "counter to our long-term interests".
The Tánaiste, Ms Harney, said the US-led effort was being supported by many democratic countries and that Ireland should not engage in a "blame game" with other EU countries.
She blamed Saddam Hussein for the conflict and said the Government "must interact responsibly with other states, most of all with our friends and partners".
She referred to the US and Britain as Ireland's "closest friends" and said because of the relationship, Ireland should not question their motives. Both countries have been there for Ireland when needed, she said, referring also to the common economic, social and cultural links. "We won't deny them now when they need us".