The telecommunications entrepreneur (50) will also sit on the board of Directors alongside managing director Ken Nottage and other board directors after purchasing a 25% shareholding in the club.
The Walkinshaw family will remain as principle owners with Tom as Chairman - a position he has held for more than a decade at the Kingsholm club.
"Any major off-field development such as this is extremely important for any club and I would like to take this opportunity of welcoming Martin on board on behalf of everyone at Gloucester Rugby," Walkinshaw said.
"Martin's involvement comes at a vital time for the club when we are growing and developing faster than at any time in our history.
"He has tremendous business acumen and will add value as a stakeholder - I am delighted to be able to bring him onboard at the club."
St Quinton has had a distinguished business career. In 1980 he started The Saint Group, a private office equipment company, which he sold to Danka PLC in 1993. From then until 1999 he was CEO of Danka's International Operations. During this six-year period he acquired over 50 companies in 30 different countries.
In 2000, he founded another company Azzurri Communications which has grown to 700 staff and a £150million turnover in eight years. In 2003, St Quinton was named Ernst & Young Technology Entrepreneur of the Year.
His interest in rugby started at Pocklington School in Yorkshire where he was 1st XV captain, he went on to play for Durham University.
St Quinton said: "I am extremely excited about the opportunity to join this club with such history, tradition and passion. To be involved with such a major institution like Gloucester is not only humbling but a tremendous challenge.
"Tom has done a huge amount for the club over the last decade and I want to support him to take the club to the next level - a level where we can challenge the best in Europe over the long-term.
"The club owns its own ground at Kingsholm and the priority will be to enlarge the stadium to a 20,000 capacity, thereby providing the financial backbone to enable to the club to consistently win trophies.
"This is a once in a lifetime opportunity and I am thrilled at the prospect of getting involved."
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