Robbie Henshaw says he is delighted to extend his IRFU contract until the end of June 2022.
The Leinster centre has been capped 37 times for Ireland since making his international debut against the USA in the summer of 2013.
He went on to cement his place in the team and started every game of the Six Nations Championship in 2015 and was instrumental in the opening two wins of the 2018 Grand Slam success before injury ended his involvement.
In the blue of Leinster the Athlone native has won the European Champions Cup and Guinness PRO14 title and has made over 30 appearances for the province.
Henshaw has won 37 caps for Ireland.
Henshaw said: "I am delighted to have signed a new three year contract with the IRFU.
"It is an exciting time to be part of Irish Rugby and having tasted success with both Ireland and Leinster in recent seasons I am eager to play a role in driving further success at both international and provincial level."
David Nucifora, IRFU Performance Director says securing Henshaw signature is a big coup:
"Robbie has established himself as a leader within this Ireland squad and has delivered consistent world class performances which have helped to drive the sustained success enjoyed by the national team.
"He has a hunger for improvement and in driving the standards of those around him."