Millward Brown already has offices in Hong Kong, Taipei and Shanghai and has been operating in the Chinese market for more than 10 years.
Account director Praveen Ramachandra and a team have relocated from Shanghai to Beijing to start the new office.
Ramachandra said: "New business has already started to come and we expect the office to expand quickly."
Michael Walkowiak, managing director of Millward Brown China, added: "China has one of the fastest-growing economies in the world, and Millward Brown is committed to keeping pace with this growth and expanding according to our clients needs.
"The Beijing office will strengthen and expand our relationships with existing clients in Northern China while improving the quality and range of services Millward Brown offers in the Asia pacific region."
Millward Brown also announced it is merging its New Zealand operations with the country's largest locally owned market research company Colmar Brunton.
The combined company will operate as Colmar Brunton, under the Millward Brown banner, with Colmar Brunton retaining majority New Zealand ownership.
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