Lassana Bathily was a Malian-born Muslim employee of the kosher supermarket that was the focus of the terror attacks in Paris.
The shop-worker managed to hide customers in a cold storeroom, away from the gunmen, who killed four people.
In light of him telling his story after the event, the French government awarded the Malian national French citizenship for his bravery.
At the ceremony Mr Blathily said:
"People say I'm a hero but I'm not a hero. I'm Lassana.
"I'll stay the same. I would do the same again, because I was following my heart."
Lassana had lived in France for the past nine years and had applied for citizenship in the last year.
The attacks in Paris on kosher supermarkets and the Charlie Hebdo magazine resulted in the killing of 17 people.