She will remain in Hong Kong and will oversee a range of communication activities to build on Barclays Capital's recent growth in the region.
She reports to John Anderson, Barclays Capital global head of corporate communications. 'This is a new role to support an expanded operation.
We have had a very good year and have recently opened in Korea and Thailand,' he said.
Her role extends across all elements of marketing and comms including media relations, internal comms and ads.
Anderson said: 'Her job will involve raising the overall awareness of Barclays Capital in the region, making sure that our deals are fully understood, that our research is fully appreciated, and overall that the strategy and the culture of the organisation is known.'
Anderson and Gallagher previously worked together when he was head of comms for Europe and Asia at the then Chase Manhattan, which later merged with JP Morgan.
Anderson said: 'Her strengths are her familiarity with investment banking products and her connection with journalists in the region. Asia is different to any other region as it has so many different cultures and you need someone in the job with a truly global view of things, which is something Maeve has.'
The bank has around 1,000 staff in Asia and currently just three communications staff based in Hong Kong and Tokyo. These will now report to Gallagher.
Barclays Capital focuses on debt raising and risk management. The firm acts as intermediary and adviser to corporations, financial institutions and governments.