Tiernan O'Halloran, who is 22, has penned a two-year deal with his home province. He started on the wing against Edinburgh last Saturday, winning his 61st Connacht cap since his debut against the Scarlets in the 2009/10 season.
A product of the Connacht Academy, the Connemara native holds the honour of scoring Connacht's first ever Heineken Cup try away to Harlequins in 2011.
O'Halloran has represented Ireland at Under-18, Under-19 and Under-20 levels and last summer travelled with the Emerging Ireland squad to play in the IRB Tbilisi Cup.
Out-half Miah Nikora has agreed terms on a new one-year contract to remain at the Sportsground.
A shoulder injury in the summer has kept Nikora out of action this season but the experienced number 10 returned to start for Connacht Eagles this month and played for Ulster Bank League club Corinthians in their bonus point win over Blackrock College last weekend.
Meanwhile, local talent Jack Carty will graduate from the Connacht Academy to a one-year professional contract next season.
The Athlone native, who is in his third season in the Academy under Nigel Carolan, captained Connacht Eagles in the British & Irish Cup this season.
With a handful of senior caps under his belt, the 21-year-old earned his first start against Leinster in early January. A week later, he played his first Heineken Cup game against Italian side Zebre.
Commenting on the province's latest re-signings, head coach Pat Lam said: "We are very pleased that Tiernan, Miah and Jack will all be with us next season and all have a significant role to play.
"Miah has endured a tough year with injury but will be desperate to make up for lost time. Tiernan and Jack are both proud Connacht-born players and testament to the young talent we have here.
"Both have shown that they have what it takes to make a real contribution to the squad and they will no doubt build on the good work done this season."