The 19-year-old son of Saints director of rugby Jim scored a try in his first two matches for Saints and has made a total of nine appearances.
Fellow backs Tom Collins, George Furbank, Rory Hutchinson, Sam Olver and Howard Packman have also signed deals.
As have forwards Will Allman, Sion Bennett, James Fish, Lewis Ludlam, Alex Moon, Jordan Onojaife and Josh Peters.
Of the group, England Under-20 wing Collins, 21, is the most experienced in a Saints shirt, having made 27 first-team appearances.
Scotland Under-20 centre Hutchinson, 20; England Under-20s 21-year-old fly-half Olver; England Under-20 wing Packman, 20 and England Under-20 second row Onojaife, 20, are the others in the group to have played for Northampton's first team.
"The Saints academy is doing its job, identifying and bringing through local talent.
"There are some highly-rated players in that group - some who've already made an impact in the first team such as Tom Collins and Harry Mallinder.
"The challenge for the club and the players is for more of them to make the step up now and break into the match-day 23 - something which has been difficult this season without an Anglo-Welsh Cup."

Allegations against the Rt Rev George Bell were first made by the victim in 1995 but were not investigated or referred to the police.
Bell was Bishop of Chichester from 1929 until his death in October 1958.
Current Bishop Dr Martin Warner issued a formal apology after the Diocese of Chichester settled the civil claim.
He paid tribute to the victim's courage in coming forward to report the abuse.
"I am committed to ensuring that the past is handled with honesty and transparency," he said.
The allegations of sexual offences against Bell date from the late 1940s and early 1950s and concern an individual who was at the time a young child.
The victim first reported the abuse to the then Bishop of Chichester, Eric Kemp, in August 1995 but no action was taken until contact was made with Archbishop of Canterbury Justin Welby's office in 2013.
Following settlement of the claim, Bishop Warner wrote to the survivor formally apologising and expressing his deep sorrow.
The victim's solicitor said they remained bitter their 1995 complaint was not properly listened to or dealt with.
"The failure to respond properly was very damaging, and combined with the abuse that was suffered has had a profound effect on my client's life," said Tracey Emmott.
"For my client, the compensation finally received does not change anything."
Another retired Church of England bishop was jailed last week for a string of offences against teenagers and young men.
Peter Ball, 83, the former Bishop of Lewes and Bishop of Gloucester was sentenced to 32 months for misconduct in public office and 15 months for indecent assaults, to run concurrently.
Northampton Saints centre Harry Mallinder is among 13 youngsters to sign new deals with the club.
[NEXT_CONCEPT]
A victim who was sexually abused as a young child by a former Bishop of Chichester who died in the 1950s has received compensation from the Church.