The 27-year old England goalkeeper has penned a deal which will keep him at the Etihad Stadium until the summer of 2019.
Hart, who joined the club from Shrewsbury Town in 2006, was delighted to commit himself to the City cause after helping the Eastlands outfit lift the 2011/12 and 2013/14 Premierships, the 2011 FA Cup and 2014 League Cup.
"I'm really happy, I've been here a long time now and I want to keep that going," he told the club's official website.
"The new deal means I get to stay longer - the club's doing amazing things at the moment, we've created history and we want to keep doing that.
"Wanting to stay here was never going to be an issue for me - I've loved every moment since I joined. The club's growing and I've been really lucky to be part of the ride.
"I just want to keep winning with the team and keep developing. A lot of the boys have signed long-term deals, so we're building as a squad and I think that quite a few of us have been here for a long time now.
"We're enjoying building that winning mentality, how the club is growing around us and how we need to grow along with it."
Manchester City FC (@MCFC) December 19, 2014
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