Dunnes Stores is an Irish multinational retail chain that primarily sells food, clothes and household wares. It was founded by Ben Dunne in 1944. In addition to its main customer base in Ireland, the chain also has operations in Spain, and formerly in England and Scotland. The format of most of the chain's stores on the island of Ireland involves a grocery supermarket operating alongside a clothing/textiles store, although some stores contain only textiles, and some contain only a supermarket. The grocery side of the business does not operate outside of Ireland, save for a limited grocery range in the Spanish stores. The larger stores usually contain a café branded as either Café Sol, Dunnes Stores Café or Baxter & Greene Market Café.

Dunnes Stores' original own brand of groceries was sold under the St Bernard brand introduced in 1956, becoming an Irish household name, but was rebranded as "My Family Favourites" in 2013.

The main domestic competitors in the supermarket business are Tesco, SuperValu, Lidl and Aldi. For many years, Dunnes Stores has maintained a top-three market share in Ireland's grocery market, alongside SuperValu and Tesco. Combined, these three supermarket chains account for approximately 70% of Ireland's grocery market.

In clothing, their rivals include Penneys, and Marks and Spencer. Dunnes collaborate for many clothing/home wares collections from a number of Irish designers such as Paul Costelloe, Padraic Harrington, Carolyn Donnelly, Lennon Courtney and new clothing from Paul Galvin. They also sell in-house clothings brands such as Savida and Gallery, along with their own Dunnes Stores brand of clothing.