Tesco Ireland Limited is the Irish subsidiary of supermarket group Tesco. Tesco Ireland was formed by Tesco plc's 1997 purchase of the Irish retailing operations of Associated British Foods, namely Powers' Supermarkets Limited and its subsidiaries, trading as "Quinnsworth" and "Crazy Prices". There are 152 Tesco stores in operation in Ireland as of August 2018. Tesco had approximately 21% of the Irish grocery market in 2019 and its main competitors are Dunnes Stores and SuperValu.

Tesco plc is a British multinational groceries and general merchandise retailer headquartered in Welwyn Garden City, England. In 2011, it was the third-largest retailer in the world measured by gross revenues and the ninth-largest in the world measured by revenues. It has shops in Ireland, the United Kingdom, the Czech Republic, Hungary, and Slovakia. It is the market leader of groceries in the UK.