The agency will work closely with Oxfam's newly created digital communications team and will be responsible for strategy, creative, search marketing and media planning and buying on the account.
The creative will support the charity's existing "be humankind" campaign, which was launched by Oxfam's advertising agency, Rainey Kelly Campbell Roalfe/Y&R, in April last year, and is based around the theme of apathy.
Oxfam called a statutory review of its digital account last November. The incumbent, Avenue A/Razorfish, which had worked with the charity for four years, was invited to repitch.
Sam Bain, the head of e-commerce at Oxfam, said: "Digital is an area of investment and focus for the entire organisation and increasingly the principal channel for our direct response campaigns."