The Lynch Hotels Group is to create 100 jobs with an investment of €12 million in hotels in Clare and Castlebar.
Most of the investment will be spent on Breaffy House Hotel in Castlebar, where it plans to add 65 bedrooms and other facilities, including a five-star health spa.
The group is also planning to renovate the West County Hotel in Ennis.
Lynch Hotels employs 1,200 people in 12 hotels nationwide.