Support for Ireland remaining in the European Union stands at 88%, an increase of 4% since the last poll in 2021.
More people also believe that Ireland should play its part in a common European defence, up 5% to 59% compared to last year.
The findings are part of the Red C/European Movement Ireland survey.
Some 79% of Irish citizens believe EU membership has had a positive impact on their lives, while 76% say they have a good understanding of how the EU works.
The survey was carried out between 18-23 March to mark 50 years of Ireland's EU membership.
With the poll being taken almost one month into Russia’s invasion of Ukraine, 59% of those questioned said Ireland should be part of increased European Security and defence cooperation.
Some 26% disagreed, while 14% said they did not know. Of those supporting the move, more were likely to be male (68%) than female (51%).
Support was greatest among the 55-64 years cohort (66%), and lowest among 18-24 year olds (54%).
"It is encouraging that today, on Europe Day and as we mark 50 years of Ireland's membership of the EU, to see support for membership rise in Ireland to 88%," said Noelle O’Connell, CEO of European Movement Ireland.
"This broad support may be reflected in the fact that a similarly large majority of people agreed the EU has impacted their own lives in a positive way.
"People's attitude to increased EU defence and security cooperation has fluctuated over the years. It averaged 58% from 2017-2019, dropped to 49% in 2020, then increased to 54% in 2021 and rose further to 59% this year. While the war in Ukraine may account for this slight increase in support, the data shows that opinion on this subject remains quite uncertain.
"Irish citizens are consistently among the most positive about EU membership when compared with other Member States.
"However, things can change rapidly. As we reflect on 50 years of EU membership, we also must continue to work to maintain this strong level of support in Ireland in the years to come," she said.