Top 3 runs as Noel delights French crowd in Chamonix
Noel said: "The second run was really challenging.
"The first run was perfect conditions, so I am really happy to manage the second. I felt the pressure so much at the start, but to win it was awesome.
I don't know why I'm so consistent, I just try to push hard and do my best every time. It paid off this time so I'm really, really happy.
Noel's combined 1:41.47 was 0.21 ahead of Norway's Timon Haugan, toasting a first World Cup podium of his career, with Austria's Adrian Pertl 0.31 back in third.
Nervy Noel's final run to hold on to Chamonix win
Frontrunners struggled as overall World Cup leader Henrik Kristoffersen came out of his first run and Swiss Daniel Yule, who laid down the fastest first run, also failed to finish in a dramatic climax.
With only three slalom World Cups remaining this season, Chamonix's return to the circuit after a four-year hiatus produced a seismic day in the race to wear red.
Noel: 'I felt the pressure at the start but that win was awesome'
Noel climbed to second place in the slalom standings, taking his tally to 550 points and hot on the heels of Kristoffersen with 552.
Pinturault, the last Frenchman to win in Chamonix and victorious in Val D'Isere, failed to cut Kristoffersen's 55-point lead in the overall standings.