Stephen Myler and George Pisi are part of a quartet of backs who have agreed to re-sign at Saints.
The club has also announced that Tom Stephenson and James Wilson will be staying at Franklin’s Gardens for the foreseeable future.
Myler and Pisi had been linked with moves away when their deals expired next summer, but Saints have won the battle to keep the pair.
And the retention of 20-year-old centre Stephenson, one of the club’s brightest prospects, and Kiwi utility man Wilson, a vital component of the squad, is also a major boost.
“We’re delighted that all four of these players have decided to stay with us and continue their career at the Saints,” said director of rugby Jim Mallinder.
“They are all quality players who have shown time and again that they have the ability and composure to compete at the highest level of the sport.
“They will remain important members of the squad for years to come.”
However, one man who will not be playing any further part for Saints is Glenn Dickson.
The Kiwi fly-half made 14 appearances for the club after joining from Otago in the summer of 2013, but he has decided to pursue opportunities elsewhere.
“We thank Glenn for his contribution and wish him the best for the future,” Mallinder said.