Electronic Arts (EA) is planning to employ 300 workers in its Irish facility, with the videogame maker already employing 400 workers in the Irish studio.
The investment comes with government support and represents a setback to the UK which has also sought to encourage video game investment.
EA COO Peter Moore, said: “Galway's mix of technology infrastructure and talent availability, combined with a pro-business environment, will help us expand on our existing foundation here."