The 26 year-old open-side has been in superb form this season earning his first England cap and started the first game of the Six Nations against Wales.
Commenting on www.gloucesterrugbyclub.com Hazell said: "This season has been a big step-up in terms of achievements with my first cap, and the new contract is a great way to keep that moving."
Hazell, who has made more than 100 appearances for Gloucester in all competitions, added: "It was a huge honour to play for England in the Autumn, and likewise in the Six Nations, and it is just as special playing for Gloucester.
"I've grown up in the city and I want to take Gloucester to the top. We had the special memory of a Powergen Cup win two years ago, and we want more of that which is why the Club has ambitious plans.
"The new contract is a big boost, but nothing changes in terms of what we've got to achieve this season. We've got to target a move up the Premiership, starting with Saturday's game against Bath."
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