Some 140 new jobs are to come on stream in Limerick.
An outsourcing field sales and marketing company is to take on 300 new staff across Ireland.
At least 100 jobs are expected to be announced at the Mater Private Hospital in Mahon, Cork today.
More than 190 full and temporary positions are being created in Dublin, Cork, Donegal and Meath in four separate job announcements today.
More than 80 new jobs are set to come on stream at security firm Homesecure.
Up to 100 jobs are to be created with the expansion of three companies in Dublin, Cork and Laois.