An audience member bluntly asked the Labour leader why he had never regarded the republican terror group as a terrorist organisation.
The question was met with a wave of applause from the audience of the BBC Question Time programme.
Describing the Good Friday peace process as a “truly remarkable experience”, Mr Corbyn responded: “I have deplored all acts of terrorism by anybody in Northern Ireland or anywhere else and I think the Good Friday agreement was a huge achievement.
Jeremy Corbyn was grilled by a voter over his alleged IRA links
“It was brought about communities that recognised their shared but different past, and brought about the idea of a power-sharing government in Northern Ireland.
“I think that was an enormous achievement.”
During a Sky News and Channel 4 debate on Monday night, a voter ripped apart the veteran left-winger about his alleged meetings with republican leaders during the Troubles.
The TV election debate – in pictures Wed, May 31, 2017
The televised debate saw Jeremy Corbyn, Amber Rudd, Paul Nuttall, Caroline Lucas, Angus Robertson, Tim Farron and Leanne Wood go toe-to-toe
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The politicians taking part in the debate
Mr Corbyn said at the time: “I wanted dialogue in Northern Ireland during the 1970s and 1980s.
“I did make contact with Sinn Fein when their leadership was not allowed to travel to Britain, for example.
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Mr Corbyn faced voters in a televised TV debate
I have deplored all acts of terrorism by anybody in Northern Ireland
“I wanted there to be a peace process. We should all be pleased we've achieved a great deal through the Good Friday agreement.”
And it emerged earlier this month that Mr Corbyn and his close ally and Shadow Home Secretary Diane Abbott voted against laws that would have prevented IRA supporters from holding office.
The Elected Authorities Act 1989 required candidates to sign a declaration that they would not express support or approval for proscribed organisations or acts of terrorism and violence for Northern Ireland.
But Mr Corbyn, along with a cabal of his left-wing backers such as Ken Livingstone and George Galloway, opposed the measures.
Theresa May could be on course to pick up 60 seats, a shock poll has found
The televised showdown also saw Theresa May interrogated over her decision to call a snap General Election.
It comes as a spate of opinion polls show Labour eating into the Conservatives’ lead, which was at one point as large as 25 points.
But a new survey by Lord Michael Ashcroft predicts the Tories could win a majority of 60 seats in Parliament.