The win bolsters the embattled leader of Britain's main opposition group amid mounting talk of a leadership challenge, and as the anti-European Union UK Independence Party (UKIP) targets voters in former Labour strongholds.
"It's a clear demonstration that Labour is the party working people trust," Corbyn tweeted in the early hours of Friday after the result was announced in the constituency of Oldham West and Royton, northern England.
Labour candidate Jim McMahon won the ballot with a majority of 10,835, down from a majority of almost 15,000 enjoyed by the last lawmaker to hold the seat, Labour's Michael Meacher.
UKIP's candidate came second with 6,487 votes.
Corbyn has had a wobbly start to his tenure as Labour leader, with many party members openly defying his anti-war, left-wing stance, stoking speculation of an eventual coup.
In a parliamentary vote on Wednesday on whether Britain should join US-led air strikes in Syria, some 67 of Labour's 231 lawmakers voted in favour of bombing.
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