Hemingway joined the bank in the summer of 2008 with responsibility for UK personal finance media relations, following 26 years heading up the press office at Halifax/HBOS.
Hemingway said: ‘I have thoroughly enjoyed my time with HSBC building what is widely recognised as a world class press team.
‘With the re-organisation of the communications function I feel that now is the right time to look for a new challenge, whatever that may be.’
Hemingway is set to take a short break before seeking a new role in the industry.
The HSBC comms division has been restructured on a global basis over the past year. The UK comms unit is now part of European comms, led by regional head of comms, Europe Andy Berry who joined this year.