The agency won the account after a pitch against two undisclosed agencies. Leo Burnett will handle the account out of its London office.
Leo Burnett will work with the International Committee on Healthcare in Danger, relating to global conflict areas, such as Sudan and Iraq.
The agency will generate awareness about how Red Cross workers are often prevented from carrying out humanitarian help in areas of conflict and can also be attacked frequently.
The International Committee of the Red Cross has worked with a number of agencies in the past, including HMDG and Abbott Mead Vickers BBDO in the UK.
The review is separate from the current pitch taking place for the British Red Cross. The organisation kicked off a review in May last year, looking for both a creative agency and media planning shop.