Masayuki Hatta (八田真行, born 1979, Japanese) is a Professor at the Faculty of Economics and Management, Surugadai University in Saitama, Japan.

Originally trained as an economist/organizational theorist, Hatta writes and speaks extensively on intellectual property issues. He is particularly interested in open source software licensing. He has also been doing research on techno-privacy issues such as encryption regulation for the past few years.

Hatta is also a hacker wannabe (an official GNU and Debian developer), an avid supporter of the Free Software cause, and a vocal advocate of hacktivism and the freedom of the Internet in general. He is a contributor to I2P, Tor, and other privacy enhancing technologies.

Hatta is also a visiting researcher at the Center for Global Communications (GLOCOM), International University of Japan. He was previously a special researcher at the Institute of Intellectual Property of Japan (2010-2011).

Hatta has been involved in several Internet-based activisms in Japan, such as Movements for Internet Active Users (MIAU), an organization modeled after EFF/ORG, and Open Knowledge Japan, the Japanese chapter of Open Knowledge. He is a founding member of both. He is also a member of several Japanese government committees, including the Committee for AI Network Society (2017-2018). He is currently a Technical and Cybersecurity Expert at Global Encryption Coalition.