The 24-year-old will lead the team out in both Celtic League and Heineken Cup matches for the coming season.
Cusiter said: "I'm really pleased that I've been asked to captain the team.
"It's a great honour and a lot of responsibility comes with the role.
"We made huge steps forward last season under Paul Thomson so I have big boots to fill but hopefully I can play my part in helping such an ambitious squad achieve its undoubted potential."
Reivers head coach Steve Bates added: "Chris is at that stage in his career where he is developing a real tactical awareness and I think it is the perfect time to get him involved in that area of the club.
"Chris is a furious competitor and will lead the team wholeheartedly from the front. There is no-one that trains harder and puts more into the game that Chris."