Eircom Limited, trading as Eir (/ɛər/ AIR; stylised eir), is a large fixed, mobile and broadband telecommunications company in Ireland. The company, which is currently incorporated in Jersey, traces its origins to Ireland's former state-owned monopoly telecommunication provider Telecom Éireann and its predecessors, P&T (the Dept. of Posts and Telegraphs) and before the foundation of the state, the telecommunications division of the GPO. It remains the largest telecommunications operator in Ireland and has overseas operations focused on the business and corporate telecom markets in the United Kingdom. The company was in majority state ownership until 1999, when it was privatised through a flotation on the Irish and New York Stock Exchanges.
Eir is currently majority owned by Xavier Niel's Iliad SA and his Paris-based NJJ Telecom Europe investment fund (64.5%). The group includes French telecommunications provider Free and Iliad Italia. Other major investors include Anchorage Capital Group (26.6%), and Davidson Kempner (8.9%).