The agency beat TBWA\London, Bartle Bogle Hegarty and Chick Smith Trott to win the business. The pitch was handled by COI.
AMV will now be briefed to develop a campaign promoting the new Child Maintenance and Enforcement Commission's Child Maintenance Options Service.
This body has been set up to offer information and support for separated families and help both parents make informed choices about child maintenance.
The work will be targeted at the 300,000 plus families who separate every year.