The account is new, so billings are unknown, but it is estimated that Siemens spends around £80m a year on global advertising.
Omnicom-owned TBWA saw off competition from Interpublic Group agencies McCann Erickson and Springer & Jacoby, and Publicis. All are on Siemens' roster for local business.
TBWA worked on a £5m campaign in June for Siemens Mobile, based around the client's sponsorship of Real Madrid FC.
That sponsorship deal expires at the end of this season and Siemens was recently linked with a £6m sponsorship deal with Chelsea.
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