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Bull's latest logo, introduced in November 2005.

Groupe Bull (also known as Bull Computer or simply Bull) is a French computer company based in Les Clayes-sous-Bois, outside Paris. The company has also been known at various times as Bull General Electric, Honeywell Bull, CII Honeywell Bull, and Bull HN. Bull was founded in 1931, as H.W. Egli - Bull, to capitalize on the punched card technology patents of Norwegian engineer Fredrik Rosing Bull (1882–1925). After a reorganization in 1933, with new owners coming in, the name was changed to Compagnie des Machines Bull.

The company has undergone many takeovers and mergers since its formation. In particular, it has had various ownership relations with General Electric, Honeywell, and NEC from the 1960s to the 1980s; and Motorola, Debeka, and France Télécom more recently. It acquired Honeywell Information Systems in the late 1980s, and later also had a share of Zenith Data Systems and Packard Bell. Groupe Bull was nationalised in 1982 and was merged with most of the rest of the French computer industry. In 1994 the company was re-privatised.

Using the slogan "Architect of an Open World", Bull today claims to be an information technology company dedicated to helping corporations and public sector bodies develop open and secure information systems to sustain their business strategies. Bull has a worldwide presence in more than 100 countries, and is particularly active in the defense, finance, healthcare, manufacturing, public and telecommunication sectors.

A 1990 Honeywell-Bull DPS 7 mainframe

Recent major products of the company are the scalable Bull NovaScale family of Itanium 2-based servers for High Performance Computing and commercial applications and the high-availability Bull Escala family of IBM Power5-architecture servers. Bull also has a Bull DPS-9000 mainframe computer range (catering to long-time customers with Bull computer installations) and a blade server line. All new products are available with a distribution of Linux as an option.

Bull also offers services, including IT consulting (from IT architecture and ‘urbanization’ to project management support), IT integration and IT operations.

The company is named after its original Norwegian founder, whose name rhymes with the fairly innocuous French word bulle (bubble), but also rhymes (in English) with the much less innocuous English word bull. Overcoming the potential negative connotations of this linguistic coincidence for advertising and marketing campaigns in English has been a continuing challenge for the company.

• Groupe Bull corporate website
• Bull's history – By the Fédération des Equipes Bull (Federation of Bull teams); also includes descriptions of Bull's products over the years