"I'm officially retired from boxing," he said on his Twitter site on Tuesday.
The Nottingham-based fighter, whose only losses came at the hands of Dane Mikkel Kessler and American Andre Ward, told Sky Sports News it was a hard decision.
"Making the decision to retire and saying 'It's been a year, it's too long, the fighting machine has gone, it's not going to come back', it's still hard.
"The last thing I think about before my head hits the pillow is boxing, and when I wake up in the morning to think what time it is, and I think it's half six, seven o'clock, should I be going for a run, where’s my trainers – it's a lifestyle, a way of life, and it's a mindset.
"I'll always have that and I think I’ll always be itching for the big fight."
Speculation that Froch would retire gathered pace this year when he relinquished his IBF super-middleweight belt after an elbow injury forced him to miss out on a money-spinning fight with Julio Cesar Chavez Jr.
(Writing by Peter Rutherford; Editing by Amlan Chakraborty)
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