O'Neills Irish International Sports Company Ltd. was established in 1918. It is the largest manufacturer of sportswear in Ireland and has manufacturing plants in Dublin and Strabane.

The O'Neill brand has become synonymous with the production of team kits, footballs and sliotars(hurling balls) for Gaelic games but is fast becoming a major supplier to rugby and soccer clubs across Ireland, Great Britain, Europe and America. O'Neills was the exclusive supplier to the Irish Provinces for many years and to the Irish International teams during their Triple Crown era