Tadhg Beirne has agreed a new IRFU contract until the summer of 2025.
The Munster and Ireland second row has become a key player for country and province in recent years.
His fine form in recent seasons has seen him earn 27 Irish caps, while he also played in two Tests for the British and Irish Lions in South Africa last summer.
Having previously played for Leinster and Scarlets, Beirne joined Munster in 2018 and has established himself with Ireland since making his debut in the summer of that year.
He has since scored six tries for his country.
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"I have made some tough decisions in my career but this was an easy one," Beirne said following the announcement.
"I am grateful to everyone who has supported me on this journey - my family, my partner and the different coaches along the way who helped me become a better player.
"Representing Munster, Ireland and the Lions over the past few seasons has been fantastic and I am looking forward to contributing in red and green in the years to come."
David Nucifora, the IRFU's Performance Director, said the 30-year-old is deserving of a central contract.
"Tadhg’s journey to a green jersey has not been a straight line but he backed himself and proved his quality.
"Since his return to Ireland in 2018 he has continued to improve his game and illustrate his worth to both Munster and Irish rugby with the consistency and quality of his performances."
Beirne started for Ireland in the loss to France in the Six Nations last weekend.