Agencies pitched last week and the winner will produce a global concept as Unicef looks to create a universal brand message as part of its regular giving proposition.
In the UK, the charity currently works with a number of agencies, including Abbott Mead Vickers BBDO (AMV), Rapp, Krow and Watson Phillips Norman.
Internationally, Unicef also uses TBWA\Chiat\Day LA and Droga 5.
Earlier this year, AMV created a short film for Unicef for the charity's "Put It Right" initiative.
The initiative aimed to inspire action to protect the rights of children around the world. Radiohead showed their support for the campaign by offering their track ‘Videotape’ as a soundtrack to the film.
Unicef was unavailable for comment.