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AppNexus is an American multinational technology company operating a cloud-based software platform that enables and optimizes programmatic online advertising. Headquartered in the Flatiron District of New York City, the company has 23 offices in North America, Latin America, Europe, Asia and Australia.

AppNexus offers online auction infrastructure and technology for data management, optimization, financial clearing and support for directly negotiated advertising campaigns. It has both demand-side platform and supply-side platform functionalities. It integrates with advertising sources including Google's DoubleClick, Microsoft's AdECN, engage:BDR and other aggregators. It operates out of multiple data centers, including one in Amsterdam serving Europe and the Middle East, in a facility shared with Equinix.

In 2016, AppNexus was ranked #21 on Forbes Magazine's "The Cloud 100" list.

In June 2018, AT&T announced it was acquiring the company and putting it under its Xandr division as a subsidiary. AppNexus was reportedly sold for $1.6 billion while most news outlets speculated the company did not sell for less than $2 billion.

AppNexus was founded by former Right Media staff, CTO Brian O’Kelley, and Mike Nolet, product manager and director of analytics, with Michael Rubenstein, a former vice president and general manager at Google DoubleClick, who joined AppNexus as president in September 2009. The company was financially backed by Microsoft, Khosla Ventures, First Round Capital, Venrock, Kodiak Venture Partners, Marc Andreessen, Ben Horowitz, and Ron Conway; as of 2015 the company had raised $250 million in financing. O'Kelley stepped down as CEO in October 2018.