Tom Collins and Harry Mallinder are among a batch of 13 young players to commit their futures to Saints by signing new contracts.
The pair have both featured regularly in the first team in recent weeks, and have been rewarded with new deals.
A total of 11 other Academy products and youngsters have also put pen to paper, including Sam Olver and Howard Packman.
“The Saints Academy has a history of producing very good players for the first team, particularly in recent years,” said director of rugby Jim Mallinder.
“Some of those are among the batch who have signed new deals, while we see plenty of potential for the rest to follow suit in the coming seasons.
“The Academy continues to play an important role for the club, so we’re pleased that their development will continue with the Saints.”
The full list of players to sign new deals is Collins, George Furbank, Rory Hutchinson, Mallinder, Olver, Packman, Will Allman, Sion Bennett, James Fish, Lewis Ludlam, Alex Moon, Jordan Onojaife and Josh Peters.