Watts, who was also a former UK chief executive of Burson-Marsteller for ten years, was said by the PRCA to have contributed enormously to the PR industry through his "passion, understanding and drive".
After leaving BM, Watts founded Reginald Watts Associates, a consultancy specialising in corporate comms, and was also president of the CIPR.
During his career Watts wrote four books on PR and comms and was a councillor for the borough of Westminster where he was elected in the Hyde Park ward between 1974 and 1982.
Watts, who had a PhD in semiotics, was later appointed chairman of Westminster council’s housing committee and was deputy Lord Mayor in the borough.
Francis Ingham, PRCA director general, said: "Reggie Watts made an enormous contribution to the industry's body of knowledge and professionalism, including through his PRCA and IPR roles. His intellectual curiosity and passion for the industry were apparent to everyone who knew him. He also happened to be an exceedingly nice man with an old-school style, and a rare appreciation of good manners. I'm very sad to hear of his passing."