OMD are believed to have fended off competition from Havas Media and Starcom MediaVest Group.
OMD has worked with Eurotunnel since 1999 and retained the account following statutory reviews in 2003 and 2009. In the UK, the business is held by OMD UK.
The process was initiated through a tender on the Official Journal of the European Union in January.
Eurotunnel operates the Channel Tunnel and the Le Shuttle rail link, which transports people’s cars and other vehicles under the Channel. It creates its own advertising.