The pitch will take place next week. MindShare, Starcom MediaVest, Universal McCann and one other agency will present. The company spends £10m in the UK annually, according to Nielsen Media Research.
Simon Foster, the senior manager, marketing impact, for Burger King, said the fast-food chain was consolidating the account in a bid "to achieve even greater consistency and cost efficiencies".
Carat won the UK and German accounts in 1998 after a competitive pitch.
The news comes as Burger King International searches for a new chief marketing officer after Andrew Brent left the company in March without a job to go to.
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