On Sunday night, a police officer was injured in a gun attack in north Belfast with him later described as being in a stable condition in hospital.
But Labour leader Mr Corbyn, prior to his first question to Theresa May at Prime Minister's Questions, told the House of Commons: "I join the Prime Minister in expressing condolences, I'm sure of the whole House, to the family of the police officer who lost his life over the weekend in Northern Ireland."
A red-faced Mr Corbyn was later reminded by Democratic Unionist Party Nigel Dodds that the police officer was still alive.
He said: "I joint the Prime Minister in wishing a speedy recovery to the police officer who was shot and injure in my constituency of North Belfast on Sunday night.
"Thankfully he was not killed but that was not the intention of the terrorist of course."
Red-faced Jeremy Corbyn wrongly told MPs the police officer 'lost his life'
I join the Prime Minister in expressing condolences… to the family of the police officer who lost his life
Earlier, Mrs May had opened the House of Commons session by telling MPs: "I'm also sure the whole House will join me in sending our thoughts to the police officer who was shot in Belfast over the weekend and to his friends and family.
"PSNI (Police Service Northern Ireland) do a superb job in keeping us safe and secure and they have our fullest support."