Sir Keir Starmer won his seat with 18,884 votes, giving him an 11,572 vote majority - but there was an 18 per cent swing away from Labour.
The Labour leader was met with boos and chants for a free palestine as he took to the stage.
The Conservatives won 2,776 votes, while the Greens won 4,030.
In 2019, he won the seat with a 27,763 vote majority and 64.5 per cent of the vote.
Holborn and St Pancras has been Starmer's seat since he first stood for parliament in 2015.
GBN
Holborn and St Pancras has been Starmer's seat since he first stood for parliament in 2015.
After boundary changes, the constituency has lost a number of voters to Hampstead & Highgate.
Giving a speech after his re-election, the Labour leader said “you have voted, it is now time for us to deliver”.
He added: "Tonight, people here and around the country have spoken and they are ready for change."
The Labour leader said he had to thank his wife Vic and his family “more than anyone” for keeping him “grounded”.
He added: “I’d like to pay tribute to my fellow candidates who put themselves forward for public service, because in this room, right here, beats the heart of our democracy, not in Westminster, or Whitehall, but in town halls and community centres up and down the country.
“In polling stations and voting booths, and most of all, in the hands of people who hold the power of the vote. It all starts here.”
Sir Keir continued: “Whether you voted for me or not, I will serve every person in this constituency.
“The mothers I sat with who lost children to knife crime, the pensioners who can’t get the doctor’s appointments they desperately need, the local businesses who’ve struggled so hard to keep their head above water. I will speak out for you. Have your back. Fight your corner, every single day.”
Holborn and St Pancras has been Starmer's seat since he first stood for parliament in 2015
PA
He also pledged to “end the politics of performance”.
He said: “Tonight people here and around the country have spoken and they’re ready for change – to end the politics of performance and return to politics as public service.
“The change begins right here because this is your democracy, your community and your future. You have voted. It is now time for us to deliver.”
Starmer is on course to lead his party to a landslide election victory with exit polls suggesting Labour will win a 170-seat majority.
The party is expected to pick up 410 seats, while the Tories are on course for 131.
The Liberal Democrats are expected to return 61 MPs, while the Greens are on course to return two.
Reform UK is expected to pick up 13 seats, while the SNP is expected to be reduced to 10 MPs.
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