Influential back row Chris Henry is one of nine Ulster players signed ahead of the 2010/11 season.
The number eight, who has captained the side on several occasions since he joined in 2006, has penned a new three-year deal with the Ravenhill club.
"I believe the squad has moved a considerable distance over the past twelve months and has now become a young vibrant side," said Henry.
"Ulster has become a challenging team, both in the Magners League and Heineken Cup, and will continue to go from strength to strength. I am really pleased that I will be part of the team for years' to come.
"They are a great bunch of guys in the squad, and there is some fantastic talent coming through, so the future with Ulster is looking really exciting."
Veteran Nigel Brady, who has won 65 caps for Ulster, Willie Faloon and Ian Whitten have all igned on two-year contracts.
Ulster operations director David Humphreys said: "The management team at Ulster are delighted that we have been able to re-sign key home grown talent to the squad.
"Our focus is to continually build on the foundations set and mould a powerful Ulster side, consisting mainly of ingenious players, with a number of high profile overseas signings.
"It has been great to see young players coming through the ranks and making their mark.
"We are very close to completing the squad for the 2010/2011 season. Over the next few weeks we will aim to announce the majority of our contract news."
Also signed to the Irish club are academy products Ian Porter, Nevin Spence, Adam Macklin and Paddy McAllister, as well as Belfast Harlequins player Neil McComb.