Joan Greenbaum (born October 7, 1942) is an American political economist, labor activist, and Professor Emerita at the CUNY Graduate Center (Environmental Psychology) and LaGuardia Community College (Computer Systems Information).

More recently, she was a fellow at the research institute AI Now (2019-2020) Greenbaum is a longtime labor activist championing workers' rights and raising awareness of social justice issues.

She was active in early efforts to unionize computer workers, which she discussed in a 2019 interview with Logic magazine,[1] and said: "I believe everything starts with a single issue.

Also in the area of participatory design, Greenbaum's work has been applied to studies of museums and cultural heritage institutions.

Windows on the Workplace: captures stories of organizations and the people who work for them, focusing on the history of office technology in the 50 years prior to publication.