Some 800 jobs are to be created as a services company plans to double its workforce.
Capita, which does back office work for top financial firms and in the public sector, will recruit the staff over the next three years taking the total on its payroll in Ireland to 1,600.
Finance Minister Michael Noonan opened the company's new offices in Dublin where the announcement was made.
"The scale and ambition of the company's investment in Ireland, and the announcement of their plans to employ 800 more people over the next three years, is a major vote of confidence in Ireland," he said.
"This announcement highlights the progress that is being made in restoring confidence and attracting investment and jobs into Ireland. I would like to wish Robbie Hughes and all his team every success in the years ahead as Capita continues to grow and prosper in Ireland."
Capita made the announcement as it opened new offices in Grand Canal Square in Dublin.
Robbie Hughes, Capita's country manager said: "This is a significant investment for Capita and underlines our confidence in Ireland as a place to do business."
Capita provides a wide range of services to clients in the public and private sectors in Ireland including centralised back and middle office services, asset management, loan administration and asset recovery, corporate services,; share registration and fund administration.
It also operates policy administration, claims and underwriting services in its life and pensions division.