He will join a bank whose sponsorships are focused on sport, youth and education. He will report to Peter Stringham, group general manager, marketing.
Morgan is effectively a replacement for William Parry, who left last year.
On the sport side, HSBC is most heavily involved in golf. In the UK it sponsors the World Match Play Championship, held at Wentworth each autumn.
Last year the bank signed a five-year contract to sponsor the richest golf event in Asia, the HSBC Champions tournament. HSBC's sponsorship deal with Formula 1 expired in 2004.
The bank does not currently retain a PR agency to promote its golf interests, said Morgan.
Prior to joining H&K last year Morgan was president of GEM London, the European arm of the GEM Group (previously Craigie Taylor International).
Morgan was in his second stint at H&K, having previously worked for the agency from the mid-1990s.
H&K has already moved to replace Morgan by promoting Andy Sutherden to the role of MD, sports marketing and sponsorship.
Sutherden joined the agency three years ago as a director. He currently handles Carling's football interests, Gillette's sponsorship and endorsement portfolio and Robinson's sponsorship of Wimbledon.
H&K London CEO Marie Louise Windeler described Sutherden as a 'driving force' in the agency's 15-strong sports team.