It has signed a 15-year lease for more than 20,000sq ft of office space in HF Development's flagship complex in George Square.
The firm will move into the G1 development in May 2011.
Ernst & Young hopes its relocation from its current premises on 50 George Square will provide a powerful springboard for future growth.
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Hide AdManaging partner Hywel Ball said: "Our investment sends out a strong message about our ambitions and commitment."