GEORGE NAOUPU, Jason Harris-Wright, Mick Kearney and Eoin McKeon have all signed contract extensions to the end of the 2014/15 season.
Thirty-year-old Naoupu's decision to stay for two more years with an option for a third comes as a significant boost for the province: "George is a strong and natural leader in our team," said coach Eric Elwood.
"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."
Naoupu was awarded the Player of the Month award for September 2012.
Hooker Harris-Wright, lock Kearney and number eight McKeon have also committed their immediate future to Connacht, each signing two-year extensions.
Connacht chief executive 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."