The move consolidates Nissan's global media and creative accounts under the Omnicom Group umbrella. OMD was already the incumbent on the Nissan global media business and sibling TBWA handles global creative for the automaker.
OMD will manage buying media for Nissan in 24 countries and for Renault in 30.
OMD referred all calls to the client, and Renault-Nissan could not be reached for comment.
"We have today been notified of Renault-Nissan's plan to re-align with Nissan's global agency of record," Jerry Buhlmann, CEO of Aegis Media, said in an e-mail. "This is clearly disappointing. We have had a great partnership with Renault, and we are proud of what we have delivered for them over the past eight years."
A spokesperson for Aegis said the Renault business was "just shy of 1% of group revenue for us."
This is the second major win for OMD in less than four days. The agency last Friday was awarded the $50 million media planning and buying account for Levi Strauss & Co.'s Levi's and Dockers brands.
Other agencies that took part in earlier rounds of the six-month review included WPP Group's Mediaedge:cia, Havas' MPG and Publicis Groupe's VivaKi.