After joining the club in 2010, 24-year-old Pyrgos has gone on to make 55 appearances in the RaboDirect PRO12 and has played 15 times in the Heineken Cup.
He made his Scotland debut off the bench against New Zealand in 2012 and scored his first try for his country the following week against South Africa.
Pyrgos, who has represented Scotland at under-20 level and has featured for Scotland A in victories over USA Eagles and England Saxons, kicked a drop goal and penalty to help Scotland A draw 16-16 with England Saxons at Scotstoun last Friday.
Speaking about his contract extension Henry Pyrgos said: "I am absolutely thrilled to have agreed this new deal with the club.
"I love playing for Glasgow and I'm looking forward to staying here and competing for the No 9 jersey.
"This season I've been up against two excellent scrum-halves, but that has made me work even harder to try and get into the team, which has really helped improve my game.
"I know that as long as I keep working hard I'll get opportunities to play and I want to continue to learn from the players and coaches I'm working with every day at Scotstoun."
Hooker Dougie Hall moved back to Glasgow in 2007, following an apprenticeship with Glasgow Caledonians and stints with Glasgow Rugby and Edinburgh.
The 33-year-old has gone on to make 122 appearances for the Warriors and has 42 caps for Scotland.
Dougie Hall said: "It was an easy decision to stay at the club and I'm happy to have agreed this new deal.
"I'm really enjoying my rugby just now and I'm part of a very good squad, which is probably the strongest it's been in the time I've been at the club.
"Now that this has been agreed I can continue to focus on my rugby and look forward to an important second half of the season."
Glasgow Warriors head coach Gregor Townsend said: "It's fantastic news that both Henry and Dougie are staying at the club.
"Henry is a top-class scrum-half who works hard to improve his game and Dougie is a very experienced hooker who has performed consistently well for the club over the past couple of seasons.
"Henry's kicking game is up there with the best out of any scrum-half in the northern hemisphere and he's developed a running side to his play which I can see becoming a real strength for him.
"He's a very good rugby player and makes good decisions to bring others into the game. I believe that Henry will continue to improve in our environment, so it's great that's he has signed up for another season.
"Dougie has been at the club for seven years and is one of the most experienced members of our squad.
"Not only is he an important player for us on the pitch but off it he provides guidance to our younger players.
"We're delighted to keep Dougie at Scotstoun and he will continue to play a big role at the club."
Both players could be involved when the Warriors return to RaboDirect PRO12 action against Connacht at Scotstoun Stadium on Sunday (kick-off 2pm).
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