Ogilvy & Mather's "Pro-age" campaign for Dove landed the silver award, while JWT's "drop a jean size" challenge for Kellogg's Special K won bronze.
The festival took place on 28 and 29 February in Singapore, the first time it has taken place outside of the US since its inception five years ago.
Mary Lee Keane, the executive director of the Effie Awards, said: "Unilever and Kellogg, top winners in past Effies, know what it takes to create effective global campaigns with a strong underlying insight and universal appeal."
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