Brian Coughlan, a key figure in an entirely home grown New York team, struck the winning point as the Exiles claimed a dramatic first ever All-Ireland JFC title success at Croke Park.
Johnny McGeeney's side lost out to Kilkenny in last year's decider but gained sweet revenge with a narrow win secured after a late fight-back.
Christy Walsh's Cats led by two points with just four minutes of normal time remaining but three late points from top scorer Shay McElligot ultimately left the teams on level terms deep into stoppage time and Coughlan popped up to kick the winner.
The son of an Offaly father and New York mother, Coughlan netted in last year's final and also struck 1-2 in Friday night's semi-final win over Warwickshire.
Kilkenny, meanwhile, beat London on Friday night and that intensive 1-13 to 0-15 victory appeared to take more out of them as they flagged in the closing stages and were powerless to prevent New York's late rally.
Kilkenny won last year's final by 3-12 to 1-9 though former county hurling stars Paul Murphy and Ciaran Wallace, their full-back and centre-back in 2022, were notable absentees this year.
Kilkenny lined out with 10 of the same team while New York showed more alterations with just eight of the same players from that 2022 final lineup.
CJ Molloy, who had a brief spell on the Donegal panel under Jim McGuinness, didn't feature last year but lined out in Friday's semi-final win over Warwickshire and again today.
Living in Donegal and part of the Ardara club, the nephew of 1992 All-Ireland Donegal hero Anthony Molloy struck New York's opening score from a free.
That tied the scores up at 0-01 apiece and they were level again at 0-02 apiece before Kilkenny briefly took the lead through Mick Malone.
But five New York points in a row, including two each from free-taker McElligot and the impressive Conor Mathers, left the Exiles sitting pretty at 0-07 to 0-03 clear at half-time.
McElligot stretched their lead to five with a pointed free after the restart though New York didn't score again for almost 20 minutes.
In the meantime, a dynamic Cats outfit ran hard at the New York defence and hauled themselves into a winning position with an unanswered 1-03 between the 36th and 48th minutes.
Kenny's last act before being substituted was to strike their 44th minute goal, rounding the goalkeeper and shooting home off his left foot after bursting onto a clever ball across goals from the right.
Emmet Loughran's 51st minute point for New York got it back to level terms briefly but Kilkenny scores from Ciaran Quilty and Carroll nudged them into a two-point lead which put them on the verge of back-to-back titles.
They couldn't hold on though and a dozen wides overall cost them as New York proved the hungrier and more efficient in the crucial closing minutes.
New York: Ryan Corrigan; Dylan Curran, Peter Cronin, Paidi Mathers; Colm Shalvey, Kevin Rafferty, Mikey Boyle; Conor Mathers (0-03), Gearoid Kennedy; Danny Corridan, Brian Coughlan (0-01), Thomas Shalvey (0-01); Shane Slattery, CJ Molloy (0-01, 0-01f), Shay McElligot (0-06, 0-04f).
Subs: Chris Mulvihill for Molloy 39, Emmet Loughran (0-01) for T Shalvey 39, Kaelan Walsh for Slattery 46, Ian Kavanagh for C Shalvey 49, Aiden Lawler for Walsh 61.
Kilkenny: Ciaran Farnan; Shane Kelly, Nathan Sherry, James Darmody; Kevin Blanchfield, Tom Kenny, Ger Malone; Tom Aylward, Jim Culleton; Conor Hennessy (0-01), Jamie Holohan, Mick Kenny (1-02, 0-02f); James Carroll (0-03, 0-01f), Ian Duggan, Mick Malone (0-01).
Subs: Joe Fennelly h/t, Ciaran Quilty (0-01) for Aylward h/t, Rory Monks (0-01) for Duggan 36, Adam Mansfield for Kenny 44, Mark Hender for Culleton 57.
Referee: David Murnane (Cork).
