Oystercatchers is handling the pitch and is in the process of putting together a longlist of agencies.
Initial meetings are expected to take place before the end of the month with pitches to follow shortly afterwards.
The charity has recently worked with agencies on a project-by-project basis, but has reinvested in its marketing budget and is planning a substantial brand campaign.
Save The Children put its direct marketing and media accounts up for pitch in November. Last week, the charity appointed John Ayling & Associates, working in conjunction with agenda21, to handle its UK media planning and buying.
The agencies won the business after a competitive pitch against MediaCom and the7stars. The account was previously handled by Carat.
The DM pitch, which is ongoing, was called in a bid to move the entire account into one agency. Save The Children had previously worked with a number of shops, including Whitewater and Partners Andrews Aldridge, on a number of projects.
Wieden & Kennedy is Save The Children's most recent retained above-the-line agency. It parted company with the charity in 2009. W&K's final campaign for the client centred on a collection of messages from young people that were delivered to world leaders at the G8 Summit.