IKEA (/aɪˈkiːə/ eye-KEE-ə, Swedish: [ɪˈkêːa]) is a multinational conglomerate founded in Sweden that designs and sells ready-to-assemble furniture, household goods, and various related services.

IKEA was started in 1943 by Ingvar Kamprad, and has been the world's largest furniture retailer since 2008. The brand name is an acronym of founder Ingvar Kamprad's initials; Elmtaryd, the family farm where Kamprad was born; and the nearby village of Agunnaryd, Kamprad's hometown in Småland, southern Sweden.

The company is primarily known for its modernist furniture designs, simple approach to interior design, and its immersive shopping concept, based around decorated room settings within big-box stores, where customers can interact with products onsite. In addition, the firm is known for its attention to cost control and continuous product development, notably the ready-to-assemble model of furniture sales, and other elements which have allowed IKEA to establish lower prices than its competitors.

IKEA is owned and operated by a series of not-for-profit and for-profit corporations collectively known and managed as Inter IKEA Group and Ingka Group. The IKEA brand itself is owned and managed by Inter IKEA Systems B.V., a company incorporated and headquartered in the Netherlands. As of April 2025^[update], there are 483 IKEA stores operating in 63 countries, and in fiscal year 2024, €45.1 billion worth of IKEA goods were sold. IKEA stores are operated under franchise from Inter IKEA Systems B.V. which handles branding, design, manufacturing, and supply. Ingka Group operates the majority of IKEA stores as a franchisee and pays royalties to Inter IKEA Systems B.V. Some IKEA stores are also operated by independent franchises. The IKEA website contains about 12,000 products and there were over 4.6 billion visitors to IKEA's websites in FY2024.

In 1943, the 17-year-old Ingvar Kamprad founded IKEA as a mail-order sales business, and began to resell furniture five years later. The first store was opened in Älmhult, Småland, Sweden in 1958, under the name Möbel-IKÉA (Möbel means "furniture" in Swedish). The name IKEA is an acronym that stands for Ingvar Kamprad Elmtaryd Agunnaryd. The acronym is composed of the initials of the founder's name as well as Elmtaryd, which is the farm on which he grew up, and Agunnaryd, which is the village close to Elmtaryd.

The first stores outside Sweden were opened in Norway (1963) and Denmark (1969). The stores spread to other parts of Europe in the 1970s, with the first store outside Scandinavia opening in Switzerland (1973), followed by West Germany (1974), Japan (1974), Australia, Hong Kong (1975), Canada (1976), Singapore, Spain and the Netherlands (1978). IKEA further expanded in the 1980s, opening stores in countries such as France (1981), Belgium (1984), the United States (1985), the United Kingdom (1987), and Italy (1989). Germany and the United States, with 55 stores (three in Puerto Rico in latter) each, are the company's biggest markets.

IKEA entered Latin America in February 2010, opening in the Dominican Republic. As for the region's largest markets, on 8 April 2021, a store was opened in Mexico City. In August 2018, IKEA opened its first store in India, in Hyderabad. There are now stores in Bengaluru and Mumbai.

In November 2021, IKEA opened its largest store in the world, measuring 65,000 square metres (700,000 sq ft), in the Philippines at the Mall of Asia Complex in Pasay City, Manila (14°31′56″N 120°58′57″E / 14.5322°N 120.9826°E / 14.5322; 120.9826).