The 35-year-old, 94-times capped flanker returned to pre-season training with the Dragons two weeks ago and has had the year-long contract confirmed after impressing regional bosses at Rodney Parade.
Head Coach Paul Turner said: "Colin has spent the past two weeks with the region on a temporary basis and it's clear that he has great ideas about the game and the future at the Dragons.
"He has a huge knowledge of the game and a proven commitment to the Dragons region, since joining us from Newcastle in 2006. Colin has already passed a great deal of experience on to the players around him and everyone at the Dragons are excited about his decision to stay with the club."
Charvis said: "I am really glad for the opportunity to work with the Dragons for another year. If I can help with some skills and contact area coaching, it is a great experience for me and a good opportunity to continue enjoying my time with the region, following two very happy years.
"There are some very good young players here and it would be great to pass on my experience from the past thirteen years to them. It's very flattering that the management here have been so keen to hold on to me for another year and I hope that some hard work in the role that they have created will benefit the region."
The flanker has made himself available to play for the region and could figure in a season that will see them compete in the Magners League, and EDF Energy and Heineken Cups.