The news follows yesterday's announcement that the 21-year-old has penned a new three-year contract, keeping him in Glasgow until at least May 2018.
Gray captained the club for the first time in the win over Connacht at The Sportsground last season, on the way to the club winning the GUINNESS PRO12 title in May.
The Glasgow-born second-row has made 40 appearances for the Warriors and has 19 caps for Scotland.
Speaking exclusively to glasgowwarriors.org, following his appointment, Jonny Gray said: "I'm hugely honored to have been named captain of Glasgow Warriors.
"I grew up supporting Glasgow and it means a lot to have been given the opportunity to captain the club, following in the footsteps of an inspirational leader like Al (Kellock).
"It's a very special day for me and my family and I'm really looking forward to leading the team."
Glasgow Warriors head coach Gregor Townsend added: "Jonny (Gray) has shown leadership qualities right back to when he was in the BT Sport Scottish Rugby Academy and had his first taste of rugby as a professional.
"He is someone who seeks out information and relishes taking on challenges. He did very well when he captained the side last season away to Connacht, in a difficult environment.
"Al (Kellock) became the captain at a young age and grew into the role to become an outstanding leader of men. Jonny will lead in his own way but already has the respect of the playing and coaching group by the way he conducts himself.
"The captain is one aspect of our leadership group and what excites me is that there are a number of leaders in our squad, setting standards, supporting and challenging their teammates on a daily basis.
"It's great for Jonny that he knows he'll have the likes of Josh Strauss, Rob Harley, Peter Horne and Chris Fusaro supporting him."
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