Delahunty will be based in Dubai and succeeds Neil Doyle, who is relocating back to the agency's London office.
Delahunty joins from Citigate Dewe Rogerson, where she has worked for ten years both in the US and UK.
A specialist in cross-border investor relations and financial communications, she has twelve years' experience advising clients on capital markets activities
She said: 'I am delighted to join Capital MS&L and to have the opportunity to lead their continued expansion in the Middle East and North Africa. Neil and his team have established a strong and highly respected business in the region and I look forward to building on their impressive track record.'
Since launching in 2006 Capital's Middle Eastern business has advised on a variety of high profile M&A and IPO deals, including the merger of NBD and Emirates bank.
She has also provided ongoing PR and investor relations advise to the likes of the Dubai International Financial Centre and the Abu Dhabi National Energy Company.