The firm has tripled revenues in the past four years, it said, and has noticed an uptick in consultancy work since the Brexit process began.
Richard Gillan, managing partner of Grant Thornton in Northern Ireland, said, “Specifically we are recruiting change management experts, IT consultants, economic advisers and cyber specialists.
Invest NI has offered £240,000 to help support the creation of the roles.
“The new jobs will not only help to develop the talent pool in Northern Ireland but will provide a substantial addition in annual salaries to the Northern Ireland economy, said Des Gartland, regional manager of the Invest NI North West Regional Office.
He added it would include roles for managers, directors and graduates.