Rainbow Room George Square scooped the award at the Scottish firm's annual congress. Is it the latest in a series of awards for the salon, which is run by franchisees Dylan Brittain and Yasmin McMail.
Courtney Murray of the salon also scooped the Creative Image award.
Salon owners Dylan and Yasmin said: "We could not be more proud of our team, they have worked so hard and we know they deserve this success. "The RRI Congress Awards really motiviate the team and inspire them for the year ahead."