"Gordon is an integral part of both the Leinster and Ireland teams and we are delighted that he has followed both Brian O'Driscoll and Ronan O'Gara by agreeing a new contract to remain with his province.
"His decision is another endorsement of the structures in place that are designed to keep our leading players with their provinces and ensure that they are available for the Ireland team."
Gordon D'Arcy said: "I am pleased to have agreed improved terms with the Union and look forward to working hard to assist Leinster and Ireland and achieve success with them over the next three years."
Mick Dawson, the Chief Executive of Leinster Rugby, said: "This is more great news for Leinster Rugby, coming on the back of our recent signings of Brian Oâ00Driscoll, Shane Jennings and Leo Cullen.
"It is also important for the squad and the Leinster supporters as we head into the last third of the season with important games in both the Magners League and Heineken Cup. Gordon D'Arcy is a player synonymous with Leinster Rugby and I look forward to seeing him continue to line out in the blue jersey."
GORDON D'ARCY - PLAYER FACTS:
School: Clongowes Wood College SJ
Date of Birth: February 10, 1980
Height: 5ft 11in
Official Leinster Caps: 119
Points Scored: 224 (39 tries, 1 conversion, 5 penalties and 4 drop goals)
Magners/Celtic League/Cup Caps: 55 (15 tries, 1 penalty and 2 drop goals)
Heineken Cup Caps: 49 (19 tries, 1 conversion, 4 penalties and 2 drop goals)
Senior Debut: Friendly v Edinburgh at Kelso, September 1998
Heineken Cup Debut: v Stade Francais at Donnybrook, September 1998
Lions Tourist: 2005 (New Zealand)
Ireland Caps: 28 (October 1999-present)
Ireland Points: 15 (3 tries)
Ireland â00Aâ00 Caps: 10
Ireland Under-21 Caps: 7
Ireland Under-19 Caps: 1
Ireland Schools Caps: 3
Leinster Under-20/21 Caps: 2