The appointment sees EHS Brann replace WWAV Rapp Collins and comes as Oxfam tries to overhaul its fundraising strategy by targeting younger donors.
As part of this drive, the charity is expected to increase its new media focus by running viral campaigns and setting up fundraising websites.
Oxfam recently announced the launch of Progreso fair trade coffee shops. It is also planning a music download service called Big Noise Music, which will offer more than 300,000 tracks. For every £1 spent on the service, 10p will go directly to Oxfam.
Neither EHS Brann nor Oxfam would comment on the appointment.
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