Robin Copeland and Dave O'Callaghan have agreed contract extensions with Munster, while academy product Rory Scannell has signed a senior deal.
Copeland has made 24 appearances and scored six tries since joining at the start of the 2014-15 Pro12 season and will remain at the club until 2018.
Despite currently suffering from an adductor injury, O'Callaghan, an academy product who made his debut in October 2012, has also extended his stay for the same period.
Scannell, meanwhile, will be promoted to a development contract at the start of 2016-17 before advancing to a full contract the following season.
Head coach Anthony Foley was pleased to have tied the trio down for the near future.
"It is great to have Robin, Dave and Rory commit to the province. Each player has their own individual attributes and are all valuable members of this squad," he said.
"With Robin and Dave we are maintaining the services of two hugely physical players that each bring different skill-sets to our overall game.
"In addition to this, both players have proven their versatility over the years in playing across the back row and at lock so we are delighted to have players of their calibre in the squad.