Migros (German pronunciation: [ˈmiɡro]) is Switzerland's largest retail company, its largest supermarket chain and largest employer. It is also one of the forty largest retailers in the world. It is structured in the form of a cooperative federation (the Federation of Migros Cooperatives), with more than two million members.

It co-founded Turkey's largest retailer, also named Migros, which became independent of Migros Switzerland in 1975.

The name comes from the French "mi" for half or mid-way and "gros", which means wholesale. Thus the word connotes prices that are halfway between retail and wholesale. The logo of the company is a large orange M. Migros is often referred to as "the orange giant" (German: oranger Riese, French: géant orange, Italian: gigante arancio).

Migros was founded in 1925 in Zurich as a private enterprise by Gottlieb Duttweiler, who had the idea of selling just six basic foodstuffs at low prices to householders who, in those days, did not have ready access to markets of any kind. At first he sold only coffee, rice, sugar, pasta, coconut oil and soap from five lorries that went from one village or hamlet to another. The strategy to cut the intermediate trade and their margins led to the broad resistance of his competitors who goaded the producers to boycott him. As a reaction to this threat, Migros started creating its own line of goods beginning with meat, milk and chocolate.

Duttweiler and his drivers expanded their inventory and, in 1926, the first market opened its doors in Zurich. His second store, in Ticino, presaged the future as it was founded as a cooperative. By 1941, the energetic entrepreneur had built a number of markets but, in that year, he basically gave the business to his customers by transforming everything from his privately owned enterprises into regional cooperatives, headed by the Federation of Migros Cooperatives.

As early as 1935, Duttweiler showed his zest for expansion by founding the Hotelplan travel agency. In 1942, the Migros brand was applied to a weekly magazine, Wir Brückenbauer (now known as Migros Magazine). Other ventures were restaurants in 1952, filling stations (Migrol) in 1954, language schools (Eurocentres) in 1956, the Migros Bank in 1957 and an insurance company in 1959.

In 1948, the economist Elsa Gasser convinced Duttweiler to introduce the self-service approach in Migros stores, paving the way for the development of Switzerland's most successful supermarket chain.

On behalf of the Migros Federation, the Zurich-based Reederei Zürich AG ordered at the H. C. Stülcken Sohn shipyard in Hamburg, Germany, the cargo ship Adele which was launched on 15 July 1952; the ship was christened by Adele Duttweiler, the wife of Gottlieb Duttweiler.