George Naoupu, Jason Harris-Wright, Mick Kearney and Eoin McKeon have all signed contract extensions with Connacht.
Thirty-year-old Kiwi forward Naoupu has signed a new two-year deal with the option to extend to a third year.
Naoupu signed from Super 14 side The Highlanders at the start of the 2009/10 season. He then moved to Kobe Steelers in Japan before returning to Connacht for a further two years.
Naoupu has played in 12 games this season and registered tries against Zebre, Leinster and the Dragons.
Eric Elwood said: “George is a strong and natural leader in our team.
"He is a phenomenal ball carrier and shows an exceptionally high work rate game after game. His has a brilliant ability to switch from back row to lock seamlessly."
Young forwards Harris-Wright, Kearney and McKeon have also committed their immediate future to the province by signing two year extensions.
Speaking about the new signing and contract extensions, CEO Tom Sears said: "The retention of key players such as George, Jason, Mick and Eoin is another clear indication that we intend to retain our best players and continue to build for a successful future.
“The fact that all of the four have committed to Connacht in the face of strong interest from elsewhere is a demonstration of both the progress they have made as players and the progress we are making as a province.
"Our squad for next season and beyond is developing very well, we are actively looking to bring in the best players we possibly can and we are confident that more of our current players will commit and we will be able to bring in some high quality signings for next year."