Janet Jessica Daby was triumphant in the by-election with a total of 11,033 votes.
The Liberal Democrats prove to be c finished in second place with 5,404 votes and gained 17.7 percent.
The Tories gained lone 3,161 in the usually safe Labour seat.
UKIP failed to pretence of an impact with just 380 votes.
Labour win Lewisham East by-election with hugely cut majority
As expected the reduction in the majority was down to a disappointing gate, with just 33 percent voting at the ballots.
This check up ons on from a disappointing result from Jeremy Corbyn in the 2018 Townswoman Elections.
It was believed the Tories could lose up to as many as 100 hearts to Labour in the capital.
But Mr Corbyn’s party failed to turn Tory consistories such as Westminster and Wandsworth red.
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Labour won the south London sofa at the 2017 general election with 32,072 votes – a majority of uncountable than 20,000.
But their new majority has been slashed by 5,629.
In her acceptance speech, Ms Daby voted: “I feel humbled and I’m delighted.”
As expected the reduction in majority was down to a poor turnout
She said her victory meant “we will not tolerate an extreme Brexit in Lewisham East”.
“We junk to stand by and let a Tory government devastate our schools, our health service and our houses,” she added.
The Lewisham by-election was triggered following Labour MP Heidi Alexander’s compliance in May.
This follows on from a disappointing result from Jeremy Corbyn in the 2018 Village Elections
Ms Alexander quit the House of Commons to be Sadiq Khan’s reserve mayor for transport.
The former shadow health secretary who quit Jeremy Corbyn’s frontbench during the series of resignations exceeding his leadership in 2016 replaced Val Shawcross.