Arcadia owns the likes of Topshop, Topman, Burton, Miss Selfridge
487 workers of the Arcadia Group - owner of the likes of Topshop - are to be made redundant.
Mandate Trade Union says the redundancies process will start from today at around 14 of Arcardia's stores.
As well as Topshop, Arcadia also owns the likes of Dorothy Perkins, Burton Menswear, Miss Selfridge, Wallis and Topman.
It follows the collapse of the UK parent company, which has gone into administration.
Over 10,000 jobs are expected to be impacted across both Ireland and the UK.