The top home improvement retailers in Europe are Leroy Merlin, Brico Dépôt, and B&Q. Leroy Merlin is a French company that operates numerous stores across Europe, offering a wide range of home improvement products and services. Brico Dépôt is another leading retailer in Europe, primarily operating in France, Spain, and Portugal, providing customers with affordable DIY solutions. B&Q, based in the United Kingdom, is also prominent across Europe and offers a comprehensive selection of home improvement products.