Catherine Connolly will be officially declared the country's tenth president at an inauguration ceremony in Dublin Castle later today.
The ceremony will take place in St Patrick's Hall where all presidents since 1938 have been inaugurated.
Yesterday evening, former president Michael D Higgins left Áras an Uachtaráin. His term expired at midnight.
In the short period leading up to Ms Connolly's inauguration, the presidential duties fall to a commission.
It is made up of Chief Justice Donal O'Donnell, Ceann Comhairle Verona Murphy and Cathaoirleach of the Seanad Mark Daly.
In a statement ahead of the conclusion of his term, Mr Higgins thanked the people of Ireland for the "warmth of reception" given to himself and his wife Sabina over the past 14 years and said that serving as president was "a great privilege".
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Ms Connolly was elected on 25 October after receiving 63% of first preference votes in a race against Fine Gael's Heather Humphreys and Fianna Fáil candidate Jim Gavin, whose name appeared on the ballot despite withdrawing from the campaign.
Ms Connolly will be declared the tenth Uachtarán na hÉireann at a ceremony just before lunchtime.
A declaration, as laid out in Bunreacht na hÉireann, will be read by Chief Justice O’Donnell and will be repeated by Ms Connolly.
Ms Connolly has elected to read the declaration in Irish.
She will then sign the declaration and will be officially declared President of Ireland.
Those attending include the Taoiseach, the Tánaiste, members of the judiciary, politicians from all parties, First Minister of Northern Ireland Michelle O'Neill along with guests from a cross section of Irish society.
After Chief Justice O'Donnell hands Ms Connolly the Seal of Office, a 21-gun salute will be fired from Collins Barracks.
Once inaugurated, Ms Connolly will make a short address to the assembled guests where she is likely to set out the themes that will define her presidency.
There will be live coverage of the presidential inauguration on RTÉ Radio 1 from 11.55am on an extended News at One.
Television coverage begins on RTÉ One and the RTÉ News Channel at 11.15am.
