Hamilton had started third, behind Ferrari's Kimi Raikkonen and Sebastian Vettel on the starting grid, and yet he beat them both to stretch his championship lead to 30 points with seven races remaining.
Brendon Hartley toys with the crowd at Monza. We will all still wake up tomorrow morning. Team mate Kimi Raikkonen, who had started on pole position, finished second.
Vettel insisted he had not been at fault in the collision but Hamilton pointed out that he and Ferrari driver Kimi Raikkonen engaged in an identical exchange later in the race with both drivers exiting the chicane cleanly.
Vettel appeared to celebrate before being told on team radio that he had been beaten by Raikkonen.
Most observers had certainly expected a hard result after Ferrari locked out the front row at Monza, yet the team's race began to fall apart inside four corners when Vettel clashed with Hamilton.
"We speak later, " was Vettel's terse response.
"Sebastian Vettel cracked under pressure, it has to be said", 1996 world champion Damon Hill commented.
Raikkonen, who sets a new fastest lap, saying there's rain on the circuit. If Ferrari are to learn from their mistakes then they must make a change.
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"[Fans] go insane whether it's practice or now in qualifying so that's nice to see, " Vettel said.
"For sure it's a disappointment right now, but very quickly I am turning the page and focusing on Singapore - I like the place and I am happy to go there". He also won the Italian GP in his 2011 and 2013 title years with Red Bull. "Maybe the clever people around Shov [Andrew Shovlin, chief race engineer] will know, but I think we just need to analyse it".
However, an early misjudgment cost Vettel as he hit Hamilton's Mercedes and briefly lost control, dropping back to 18th.
They swept the front row in qualifying at the fastest track on the calendar, the Ferrari's straight line speed leaving champions Mercedes in no doubt that they had a fight on their hands.
Swedish Formula 1 driver Marcus Ericsson was lucky to escape injury after crashing in spectacular fashion due to a DRS failure.
"I don't want to go any further because it could be read in another way that I am trying to find excuses, but they have certainly had a very, very good auto [on Saturday] and a good vehicle [on Sunday]".
"It was just unbelievable how intense it was, and that's how racing should be".
Hamilton's Mercedes team-mate Valtteri Bottas came home third ahead of Vettel with Max Verstappen taking fifth place in the classified result, after finishing third on the road, following a time penalty.