Scarlets trio Scott Williams, Gareth Maule and Adam Warren have all signed new contracts.
The centres join a growing list of players who have recently pledged their future at Parc y Scarlets.
Simon Easterby's squad has been strengthened with new deals for Wales internationals Ken Owens and Aaron Shingler, influential Scarlet front rowers Phil John and Emyr Phillips, as well as new signing Steve Shingler from London Irish.
"These are important signings for us," said Easterby. "And if you add these players to the core of international and regional talent we have already in contract with us, there is a very strong foundation being retained here at the Scarlets in terms of experience, quality and flair which is key to our ambition.
"Add the eight players that we have signed going forward so far this season to a squad list that includes international class players like Jon Davies, Rhys Priestland, Liam Williams, Gareth Owen, Rob McCusker and Josh Turnbull plus a group of very talented young emerging players and we have a lot to be positive about.
"To have secured key players like Ken Owens and Scott Williams with the value and profile they have both inside and outside Wales, shows that wherever possible, we are committed to retaining our best talent and have the ambition push forward rugby at Parc y Scarlets and reward our loyal, supporters, partners and sponsors."
"I am delighted to be staying at the Scarlets - I wouldn't want to play my rugby anywhere else and it was important to me to be part of this rugby squad and region having grown-up with Scarlets rugby," said Williams.
"The team has shown its determination and ability this season and to be in the race now for the play-offs in the PRO12 means everything to the players and supporters at Parc y Scarlets."