Published Tuesday, 22 October 2013
It will keep the back-row forward at the province until at least June 2017.
Henry becomes the latest player to sign up after the likes of Ruan Pienaar and Paul Marshall.
The 29-year-old said: "I am delighted to have committed to Ulster for the long-term.
"This squad is getting better and better. We have experience as well as young players coming through who are proving that they can perform at the very highest level.
"From a personal point of view, I want to win more caps for Ireland and my aim is to be part of the World Cup squad in 2015.
"In my opinion, being at Ulster gives me the best chance to fulfill that ambition."
Mark Anscombe's players have made a decent start to this year's Pro12, currently sitting in fourth place, and have enjoyed Heineken Cup wins over Leicester and Montpellier.
Henry, who has won eight international caps for Ireland and has played 109 times for Ulster, said he believes the Ravenhill club is poised for further success this season.
He continued: "It is a great team to be a part of and there is no doubt that when it comes to winning silverware - we have some unfinished business to do."
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