Block & Quayle, better known by its abbreviation B&Q, is a well-known British multinational DIY and home improvement retailing company. The business was established in March 1969 by Richard Block and David Quayle, and it is based in Eastleigh, England. Kingfisher Plc owns the entire subsidiary. As of January 2023, B&Q has 316 locations and catered to clients throughout the UK, Guernsey, Jersey, Isle of Man, and Ireland. The company sells a wide variety of goods, such as gardening tools, plants, and supplies for do-it-yourself home improvements.

The first B&Q store was established in Southampton, England, when the company's founders converted an old furniture warehouse. By 1979, there were 26 stores spread across the United Kingdom as the brand quickly grew in popularity and appeal. More growth occurred during the 1980s as a result of mergers, purchases, and expansions. B&Q created novel trade models including HomeCentres and AutoCentres, providing a broad selection of products to meet the needs of various clientele.

B&Q has consistently evolved to suit shifting market demands over the years, demonstrating perseverance and adaptability. The business entered foreign markets in the 1990s by establishing its first overseas subsidiary in Taiwan. With the launch of its first store in Shanghai, additional growth was witnessed in the 2000s. As of 2023, B&Q is still thriving under the ownership of Kingfisher plc, providing over 40,000 products to millions of clients through their physical stores and online site.