Janusz Kacprzyk (born 12 July 1947) is a Polish engineer and mathematician, notable for his contributions to the field of computational and artificial intelligence tools like fuzzy sets, mathematical optimization, decision making under uncertainty, computational intelligence, intuitionistic fuzzy sets, data analysis and data mining, with applications in databases, ICT, mobile robotics and others.

He is a foreign member of the Spanish Royal Academy of Economic and Financial Sciences (2007), of the Bulgarian Academy of Sciences (2013), of the Finnish Society of Sciences and Letters (2018), of the Royal Flemish Academy of Belgium for Science and the Arts (2019), as well as member of Academia Europaea and the European Academy of Sciences and Arts, and fellow of multiple professional societies, like IEEE, Institution of Engineering and Technology (IET), European Coordinating Committee of Artificial Intelligence (EurAI/ECCAI), IFSA, and Mexican Society for Artificial Intelligence (SMIA).

[1] As of 2018, Kacprzyk is professor of computer science at the Systems Research Institute, Polish Academy of Sciences, at Warsaw School of Information Technology, and Chongqing Three Gorges University, Wanzhou, Chinqgqung, China.

He is honorary foreign professor at the Department of Mathematics, Yili Normal University, Xinjiang, China, as well as part-time professor of automatic control at Polish Industrial Institute of Automation and Measurements (PIAP) and part-time professor in the Department of Electrical and Computer Engineering, Cracow University of Technology.

Kacprzyk has been a frequent visiting professor in the US, Italy, UK, Mexico, China, Japan.