Tributes have been paid from across the sport.
London Welsh said in a statement: “London Welsh is extremely sad to hear of the passing of another legend of London Welsh, Kevin Bowring.
“Whilst Kevin did not play for Wales like so many other greats at London Welsh, Kevin would hold the historic honour of being the first professional coach of the Welsh National side from 1995 to 1998.
“Always one of us, never forgotten.”
WRU community director Geraint John said: “So sad to hear the news that Kevin Bowring has passed away. A true rugby person, a friend, mentor to myself & many people around the world. Sending love & condolences from myself & all at the Welsh Rugby Union to Wendy and family. One of the best.”
Cardiff Rugby said in a statement: “We are all so sad to hear of the passing of Kevin Bowring.
“An incredibly kind, knowledgeable and passionate rugby man who has been a mentor to so many over the years.
“Our thoughts go out to Kevin’s family and friends at this difficult time.”
Former Wales forward and much-travelled coach Phil Davies described Bowring as “a wonderful man and a true gentleman. An amazing advocate for coaching and has influenced so many a true trail blazer.”
Fiji Olympic-winning Sevens coach Ben Ryan said: “Mentored me, taught me, moulded me. Pushed my thinking upstream, when as a young coach I only ever swam downstream. Made me always want to learn, to grow. A beautiful man and I will carry his spirit in all I continue to do. Rest in Peace Kev.”
Former Wales and British and Irish Lions back Dafydd James posted: “Extremely sad news to hear of the passing a great rugby man with an outstanding vision for how the game should be played, but also very good man. Sincere condolences to the family and friends.”
Warren Abrahams, the former Wales women’s coach, wrote: “RIP Kevin Bowring! I will be forever in debt for the support and guidance you’ve given me. The words of wisdom during my hardest coaching role will always be appreciated. Your final words “belief in yourself” will inspire me for the rest of my life.”