EY is to create 600 new jobs across its 10 offices in Ireland.
This will be made up of 237 experienced hires and 363 graduate roles in technology, corporate finance, business advisory, tax and accountancy and other areas.
This will bring the consultancy firm's headcount to just under 3,700 across the island of Ireland.
Some 366 of the roles will be based in two Dublin offices - and the others will be spread across Belfast, Cork, Galway, Limerick and Waterford.
This breaks down as 136 in Belfast, 55 in Cork and 43 across Galway, Limerick and Waterford.
The company says this follows a period of "market-leading double-digit growth for EY" over six consecutive years.
EY will actively recruit candidates to fill a variety of roles in growth areas including emerging technology, data analytics, IT advisory, risk, cyber, digital strategy and programme management.