Helsinki Institute for Information Technology HIIT (Finnish: Tietotekniikan tutkimuslaitos HIIT, Swedish: Forskningsinstitutet för informationsteknologi HIIT) is a joint research unit of two leading research universities in Helsinki, Finland, the University of Helsinki (UH) and Aalto University.
The work of the institute is organised in four research programmes, covering algorithmic data analysis, future Internet, network society, and probabilistic adaptive systems. Much of the work is carried out in competitively funded projects in co-operation with Finnish and international partners. The institute is led by Samuel Kaski, who was selected to continue the work of Martti Mäntylä from Helsinki University of Technology, Esko Ukkonen from University of Helsinki, and Heikki Mannila. HIIT has about 200 researchers and staff.