Haridimos "Hari" Tsoukas (born 1961) is a Greek theorist on organization and leadership.
Tsoukas currently is The Columbia Ship Management Professor of Strategic Management at the University of Cyprus, and Distinguished Research Environment Professor of Organization Studies at the Warwick Business School, University of Warwick.
He has conducted pioneering research in the fields of knowledge-based perspectives on organizations, the epistemology of practice, epistemological issues in organization theory, and management of organizational change and social reforms.
Besides his work in research and education, Tsoukas contributed to different publications amongst which an assignment as Editor-in-chief (2003–2008) of Organization Studies, the renowned peer-reviewed academic journal.
Tsoukas published more than 65 works in 200 publications, held in more than 3400 libraries worldwide.