The Associate Professor of Accounting received the grant on a competitive basis and said she would look to "push the frontiers" of research into corporate governance.
She joins Anna Pavlova, Associate Professor of Finance, and Paolo Surico, Associate Professor of Economics, who also secured ERC funding, totalling €2,735,835.
The ERC received more than 2,500 applications from the physical, social and life sciences across Europe and less than one in 10 proposals were awarded funding.
Dr Tuna said: "I would like to thank the ERC for providing me with such an opportunity, and I look forward to working with my colleagues throughout the School in pursuing a more ambitious research agenda. My research in this area focuses on the measurement of corporate governance and also studies the interaction between financial reporting and governance.
"I would like to use this opportunity to push the frontiers of such research by expanding our thinking on how to measure this broad concept."
The grant was made under the ERC's third competition for the Starting Independent Researchers scheme.
The ERC aims to stimulate scientific excellence by providing support for the most creative and best scientists, scholars and engineers, giving them the opportunity to be adventurous and take risks in their research. The award will provide valuable resources to support teaching buyouts, research assistance and direct research expenses.