Gartner, Inc. is an American research and advisory firm focusing on business and technology topics. Gartner provides its products and services through research reports, conferences, and consulting. Its clients include large corporations, government agencies, technology companies, and investment firms.

Gartner is a research and advisory firm with three business segments: research, conferences, and consulting. As of December 2024, Gartner has over 21,000 employees globally and operates in 90 countries and territories. It is headquartered in Stamford, Connecticut. Gene A. Hall is the chief executive officer.

Gartner is a publicly traded company listed on the S&P 500.

Gideon Gartner and David Stein founded Gartner, Inc. in 1979 to provide IT industry research and analysis to businesses buying and selling computer hardware. Gideon Gartner had previously worked at IBM, and his new firm specialized in information about IBM and its products.

Gartner's reports were often delivered as a one-pager containing only high-level insights. Gartner analysts developed the Magic Quadrant visual framework of placing companies within defined market quadrants during the early 1980s and began to integrate the methodology into their presentations and later reports. By 1983, the firm employed 80 research analysts and generated $8 million in revenue.

In 1985, Gartner's brokerage and investment division separated from the firm to become a wholly owned subsidiary called Gartner Securities. Two years later, the name was changed to SoundView Financial Group, which eventually operated as SoundView Technology Group.

In July 1986, Gartner rebranded as Gartner Group and became a publicly traded company. In January 1987, Gartner Group acquired another technology research firm, the Cupertino-based Infocorp. That same year Gartner reported $25 million in sales and $1.9 million in earnings.

The U.K.-based Saatchi & Saatchi acquired Gartner Group in 1988.