The 24-year-old made his Scotland debut in their RBS 6 Nations defeat by England last weekend, having made 64 Warriors appearances since joining the club in 2010 and captained the side on occasions this season.
His new deal will keep the Fifer at the club until 2016: "Since joining the Warriors I've never looked back and I'm delighted to be staying at the club for another two years," said Fusaro.
"I'm enjoying working with the coaches and my game has really developed over the past few years. I was so proud to make my Scotland debut on Saturday and although I was very disappointed with the result, I will never forget the experience.
"I believe the best place for me to be is in Glasgow, as it's a club with a very bright future with success on the horizon."
Gregor Townsend, the Warriors head coach, added: "It's fantastic news for the club that Chris has decided to stay and continue his development in Glasgow.
"Chris has had a very good season, which has led to him winning his first cap on Saturday. He displays leadership qualities everyday at the club. Chris epitomises what you want to see in a rugby player and is very well respected by everyone in the group."