Adweek is a weekly American advertising trade publication that was first published in 1979. Adweek covers marketing, creativity, client–agency relationships and the media, technology and platforms which support the global marketing ecosystem. During this time, it has covered various shifts in technology, including cable television, the shift away from commission-based agency fees, and the Internet.

As the second-largest advertising-trade publication, its main competitor is Advertising Age. Adweek also operates the Adweek Blog Network, which was formed from the assets of Mediabistro.

Related publications include Brandweek, Adweek Magazine's Technology Marketing (ISSN 1536-2272), and Marketing Week (ISSN 0892-8274).

In 2018, the company produced the first Brandweek, event, a first-of-its-kind summit held September 23–25, 2018 in Palm Springs, Calif. Subsequent summits have been held in Miami. Brandweek was also previously a weekly American marketing trade publication that was published between 1986 and April 2011.

In 1990, Affiliated Publications Inc., which publishes The Boston Globe, agreed to acquire 80 percent of the outstanding common stock of A/S/M Communications Inc., which published Adweek. The magazine stabilized in the 1990s.

In April 2008, Alison Fahey, Adweek's editor of ten years, was promoted to publisher and editorial director. She was replaced as editor by Mike Chapman, formerly of the Economist Intelligence Unit and eMarketer.

On June 2, 2020, Los Angeles–based investment firm Shamrock Capital acquired Adweek from Canadian private equity firm Beringer Capital, which had acquired Adweek in July 2016.

On July 26, 2023, Will Lee was announced as Adweek's CEO.