Stephen Archer, Dave Foley, Felix Jones and Dave Kilcoyne have all signed contract extensions with Munster and the IRFU.
Tight-head prop Archer has signed a three-year deal and Foley, Jones and Kilcoyne two year deals keeping them at Thomond Park until June 2017.
Archer, Kilcoyne and Foley are all products of the province’s academy while Jones has been with Munster since 2009, and all four players have now represented Ireland.
Munster have won their last seven games on the bounce and the news will come as a further boon for head coach Anthony Foley, who said: "This is a great step forward for us.
“Securing players of this calibre is always a boost for the club and it shows our commitment to developing home-grown players and talent.
“These guys have come through the structures and have reached international level with so much more to come, and it’s hugely positive for all involved.”