Diesel S.p.A. is an Italian design company. It is best known for luxury, pret-a-porter clothing aimed at the young adult market. The company is owned by its founder Renzo Rosso, and is based in the former Laverda building area in Breganze, northern Italy.

The company was founded by Renzo Rosso in 1978. Diesel's milestone years include 1985, 1988 the hiring straight out of fashion college of ex-head designer and Creative Director Wilbert Das, 1991 (beginning of the international marketing strategy) and 1996 (opening of Diesel's first flagship store on New York City's Lexington Avenue). Renzo said that they learnt marketing from the US, creativity from Italy and systems from Germany.

In February 2007, the company launched a major intimates and beachwear division for men and women that is carried in the retail and department stores. Diesel Black Gold was announced in November 2007. The company has around 2,200 employees in 18 subsidiaries across Europe, Asia and the Americas. Its products are available in 5000 retail outlets, of which 300 are Diesel-branded stores. Annual sales were approximately €1.2 billion in 2005, and €1.3 billion in 2009. Revenue is largely derived from denim sales, but also extremely successful and influential ranges of accessories and children's wear - Diesel Kid. Production of denim jeans is based mainly in Italy. The biggest store is located in Milan, Italy.

Diesel may refer to:

A brand is a "Name, term, design, symbol, or any other feature that identifies one seller's good or service as distinct from those of other sellers."Branding began as a way to tell one person's cattle from another by means of a hot iron stamp. A modern example of a brand is Coca Cola which belongs to the Coca-Cola Company.

Marque or make are often used to denote a brand of motor vehicle. A concept brand is a brand that is associated with an abstract concept, like breast cancer awareness or environmentalism, rather than a specific product, service, or business. A commodity brand is a brand associated with a commodity. Got milk? is an example of a commodity brand.

The word "brand" is derived from the Old Norse brandr meaning "to burn." It refers to the practice of producers burning their mark (or brand) onto their products.

The Italians were among the first to use brands, in the form of watermarks on paper in the 1200s.

Although connected with the history of trademarks and including earlier examples which could be deemed "protobrands" (such as the marketing puns of the "Vesuvinum" wine jars found at Pompeii), brands in the field of mass-marketing originated in the 19th century with the advent of packaged goods. Industrialization moved the production of many household items, such as soap, from local communities to centralized factories. When shipping their items, the factories would literally brand their logo or insignia on the barrels used, extending the meaning of "brand" to that of trademark.