Cullen led the province on seven occasions last year since his return from the Leicester Tigers in the summer of 2007.
The Newtownmountkennedy man has made 102 appearances in two spells for the province (17 in total as captain) between 2003 and 2008.
Having been a part of last year's leadership team, this appointment ensures continuity and Cullen will be joined by Shane Jennings and Chris Whitaker who have been named as vice captains.
Guinness PRO12
Suite 208, Alexandra House,
The Sweepstakes
Ballsbridge, Dublin 4, Ireland
63x46.png){kind=logo}