WPP will put Who Digital, which was founded in 2005 and is based in Ho Chi Minh City, into a joint venture with the Vietnamese outpost of its OgilvyOne network.
The agency employs 25 people and works for clients including Unilever, Megastar, HSBC, Baoviet and Sony Ericsson.
WPP has been operational in Vietnam for more than 10 years and its media division, GroupM, holds stakes in three subsidiaries of the country's media and advertising group DacvietVAC Group Holdings.
The acquisition is a continuation of WPP chief executive Sir Martin Sorrell's strategy of focusing on emerging markets, where it appears to be facing increasing competition for assets from French rival Publicis Groupe, which spent US$110m on a 49 per cent stake in Brazilian agency Talent in October.
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