Three Ireland (Hutchison) Limited, commonly known as 3 Ireland or Three Ireland, is a telecommunications and Internet service provider operating in Ireland as a subsidiary of CK Hutchison Holdings, operating under the global Three brand. The company launched in July 2005 and provides 2G GSM, 3G UMTS, 4G LTE and 5G NR mobile phone services. Three's former holding company, Hutchison Whampoa, acquired O2 Ireland in June 2013, and the company was fully merged into the operations of Three Ireland in March 2015.

Vodafone Ireland Limited, a wholly owned subsidiary of the Vodafone Group, is a mobile phone network and broadband provider in Ireland. It was created when the Vodafone Group bought Eircell, the mobile arm of Telecom Éireann. As of September 2019, Vodafone has 26% of broadband subscribers, and 43% of mobile phone subscribers.